What is the next number of the following sequence 1,5,21,85,.....

Neha Rani   11 years AGO

1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341 ans

Like? Yes (15) | No (6)  

Udhaya kumar   11 years AGO

1+4=5
5+4*4=21
21+4*4*4=85
85+4*4*4*4=341...............

Like? Yes (14) | No (7)  

jahnavi   11 years AGO

1+4=5
5+(4*4)=21
21+(4*4*4)=85
85+(4*4*4*4)=341

Like? Yes (2) | No   

sriganesh   11 years AGO

1+2^2=5
5+4^2=21
21+8^2=85
85+16^2=341
So Option 3 is Correct

Like? Yes (1) | No   

Annapurna   11 years AGO

Difference between the two numbers is multiplied by 4

Like? Yes (1) | No   

VIVEK SINHA   11 years AGO

series is:
5=(1*4)+1
21=(5*4)+1
85=(21*4)+1
so next number will be =(85*4)+1=341

Like? Yes (2) | No (1)  

kiran gupta   11 years AGO

1+4=5
5+16=21
21+64=85
85+256=341

Like? Yes (1) | No   

Abhishek Dadhich   11 years AGO

its an AP with a geometric differrence of 4.

1, 1+4, 1+4+4*4 and so on..

therefore 85+64*4=85+256= 341
That is option 3

Like? Yes (1) | No   

R.RAVIKUMAR   11 years AGO

given series is 1,5,21,85,?
The sequence is (1st number)*4+1=2nd number
so, 85*4+1=341

Like? Yes (2) | No (1)  

Kalpana   11 years AGO

1+4=5
5+(4*4)=5+16=21
16+(4*4*4)=16+64=85
85+(4*4*4*4)=85+256=341

Like? Yes (1) | No   

Amit   11 years AGO

4, 16, 64, 256
hence 85+256=341

Like? Yes (1) | No   

sivaramakrishna   11 years AGO

1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341

Like? Yes (1) | No   

vijay kumar v   11 years AGO

5-1:4

21-5:16


85-21:64

341-85:256

Like? Yes (1) | No   

Darshan   11 years AGO

the diff btw 2 no s multiplied 4 times and added to nxt no

Like? Yes (1) | No   

Rahul Gupta   11 years AGO

1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341
Ans.3

Like? Yes (2) | No (2)  

Shubham Saxena   11 years AGO

1
1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341

Like? Yes (2) | No (2)  

Jasmine Khan   11 years AGO

1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341

Like? Yes (3) | No (3)  

Lavankumar Reddy   11 years AGO

1, 1+(1*4), 5+(4*4), 21+(16*4), 85+(64*4)
So 85+256 = 341

Like? Yes (1) | No (1)  

Harjit kaur   11 years AGO

1
5=4*1+1
21=4*5+1
85=4*21+1
So next no is 85*4+1=341

Like? Yes (1) | No (1)  

KRISHNAN   11 years AGO

The number is going up by 4^(n-1) each time
4^(0) = 1
1+4^(1)=5
5+4^(2)=21
21+4(3)=85
thus 85+4^(4)=341

Like? Yes (2) | No (2)  

srinivaskumar merugu   11 years AGO

Difference between given numbers is 4,4*4,4*4*4,4*4*4*4....so the number after 85 is 341.

Like? Yes (1) | No (1)  

julee verma   11 years AGO

since 1*4+1=4+1=5,
5*4+1=20+1=21,
21*4+1=84+1=85,
hence 85*4+1=340+1=341
so correct answer is 341

Like? Yes (3) | No (3)  

rohit kumar   11 years AGO

1*4+1=5
5*4+1=21
21*4+1=85
so next term will be,
85*4+1=341...ANS

Like? Yes (1) | No (1)  

Anantharaman   11 years AGO

1,5,21,85,

1+4=5
5+16=21
21+64=85
85+256=341

Option 3

Like? Yes (1) | No (1)  

poonam   11 years AGO

1*4+1 =5
5*4+1=21
21*4+1=85
85*4+1 =341

Like? Yes (1) | No (1)  

a.k.gayathridevi   11 years AGO

1
1+(4^1)=5
5+(4^2)=21
21+(4^3)=85
85+(4^4)=341
so ,the next no in the series is 341

Like? Yes (1) | No (1)  

Chithra   11 years AGO

1+4=5, 5+16=21, 21+64=85
85+256=341

Like? Yes (1) | No (1)  

arun prakash singh   11 years AGO

1,5,21,85,341

Like? Yes (1) | No (1)  

Tanu   11 years AGO

1sq +0 =1
2sq +1 =5
4sq +5 =21
8sq +21 =85
16sq +85 =341

Like? Yes (1) | No (1)  

PRATHAM MEHROTRA   11 years AGO

next number is 4 times the previous number +1

Like? Yes (1) | No (1)  

Ashfaque Hussain   11 years AGO

Next term = N * 4 + 1

1*4 + 1 = 5
5*4 + 1 = 21
21*4 + 1 = 85
85*4 + 1 = 341

Like? Yes (3) | No (3)  

FAISAL RIZWAN   11 years AGO

Given series 1,5,21,85
0+1^1=1 or 0+2^0=1
1+2^2=5 1+2^2=5
5+4^4=21 5+2^4=21
21+8^8=85 21+2^6=85
85+16^16=341 85+2^8=343

so option 3 is correct

Like? Yes (3) | No (3)  

AMIT JAISWAL   11 years AGO

1*4+1=4+1=5
5*4+1=20+1=21
21*4+1=84+1=85
hence 85*4+1=340+1=341
so answer will be 341

Like? Yes (2) | No (2)  

Rajasekhar Reddy   11 years AGO

1^2 = 1;
2^2+1 = 5;
4^2+5 = 21;
8^2+21 = 85;
16^2+85 = 341

Like? Yes (1) | No (1)  

ramneet kaur   11 years AGO

341.. BY ADDING SQUARES OF 4.. 4 , 16 , 16 , 256....

Like? Yes (1) | No (1)  

P.Bindusree   11 years AGO

(5-1=4) (21-5=16)(85-21=64)
(4*4=16)(16*4=64)(64*4=256)
256+85=341

Like? Yes (1) | No (1)  

Roushan Singh   11 years AGO

Multiply the number with 4 and then add 1
1*4+1=5
5*4+1=21
21*4+1=85
similarly,
85*4+1=341

so,the answer is: 3) 341

Like? Yes (1) | No (1)  

sreetej   11 years AGO

the difference between the successive numbers are in the series of 4 , 4^2 , 4^3 , 4^4=256 so 256+85=341

Like? Yes (1) | No (1)  

KARUPPASAMY C   11 years AGO

1,5,21,85,341....
5-1=4
21-5=16
85-21=64
341-85=256
so option is 3

Like? Yes (1) | No (1)  

Gundavarapu Parameswari   11 years AGO

5-1=4
21-5=16
85-21=64
x-85=4^4
x=256+85
x=341

Like? Yes (1) | No (1)  

vineeth k k   11 years AGO

1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341

Like? Yes (1) | No (1)  

sambasiva rao   11 years AGO

diff 5-1=4
diff 21-5=16
diff 85-21=64
the diff between 2 nums is 4,4^2,4^3
so next num x-85=4^4
x=256+85
x=341

Like? Yes (1) | No (1)  

shivam pandey   11 years AGO

341 Because 1*4+1=5,5*4+1=21 so follow 85*4+1=341.

Like? Yes (1) | No (1)  

chandra   11 years AGO

difference is multiples of 4 and it is added to the previous num to get the next num

Like? Yes (1) | No (1)  

AMIT   11 years AGO

here in the series
5=1*4+1
21=5*4+1
85=21*4+1, so next series will be 85*4+1=341

Like? Yes (1) | No (1)  

susmit   11 years AGO

difference between 1 and 5 is 4
difference between 5 and 21 is 16
difference between 21 and 85 is 64
4,16,64 are in G.P. SO THE NEXT DIFFERENCE WILL BE 64*4=256
SO THE NEXT NUMBER IS 85+256=341
OPTION NO, (3)

Like? Yes (1) | No (2)  

Vignesh Kumar   11 years AGO

1 = 4^0
5 = (4^1)+1(previous number)
21= (4^2)+5(previous number)
85= (4^3)+21(previous number)...
so, the next number is
(4^4)+85 = 341...

Like? Yes (2) | No (3)  

Paranthamakannan   11 years AGO

4^0
(4^1)+1
(4^2)+5
(4^3)+21
the next no is
(4^4)+85 = 341

Like? Yes (2) | No (3)  

Dipak Shaw   11 years AGO

1
1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341

Like? Yes (2) | No (3)  

vigneshwari   11 years AGO

1x4 + 1 = 5
5x4 + 1 = 21
21x4 + 1 = 85
85x4 + 1 = 341 (required number)

Like? Yes (2) | No (3)  

Prabhat Yadav   11 years AGO

1
5=1*4+1
21=5*4+1
85=21*4+1
341=85*4+1

Like? Yes (3) | No (4)  

Sushil Singh   11 years AGO

first term= 1
second tern=1*4+1=5
third term =5*4+1=21
fourth term=21*4+1=85
fifth term =85*4+1=341

Like? Yes (1) | No (2)  

Ayush Rastogi   11 years AGO

1,5,21,85,....
5-1=4^1
21-5=16=4^2
85-21=64=4^3
341-85=256=4^4

Like? Yes (2) | No (3)  

Devendra Marghade   11 years AGO

1+4^1=5
5+4^2=21
21+4^3=85
85+4^4=341

Like? Yes (2) | No (3)  

Balakumaran N.A   11 years AGO

Sequence increasing by 4,16,64,256,...
256+85=341.

Like? Yes (2) | No (3)  

Harshit Daga   11 years AGO

The difference between the numbers is like 4, 16, 64, 256 and so on......

Like? Yes (1) | No (2)  

Dinesh thatti   11 years AGO

1 + 4 (2^2)= 5

5 + 16 (4^4)=21

21 + 64 (8^8)=85

85 + 256 (16^16)=341

so option is 3 i.e 341

Like? Yes (1) | No (2)  

harjeet   11 years AGO

the difference is periodically increases as
1-5= 4 = 4^1
21-5= 16 = 4^2
85-21=64 = 4^3

so next should be= 4^4= 256
and
256+85=341(3)

Like? Yes (2) | No (3)  

Grishma Shah   11 years AGO

the series is 4^0, 4^1, 4^2, 4^3, 4^4, 4^5...
1,4,16,64,256...
series is: 1,1+4,1+4+16,1+4+16+64,1+4+16+64+256..
1,5,21,85,341..

Like? Yes (1) | No (2)  

Anchuri Sandeep Reddy   11 years AGO

1,5,21,85...........

0+2^0=1

1+2^2=5

5+2^4=21

21+2^6=85

85+2^8=341

here in the series previous term is added to new term with 2^even numbers(0,2,4,6,8....)
similarily next term is 341+2^10=1365

Like? Yes (2) | No (3)  

SauravTiwari   11 years AGO

The sequence is 2^0+0, 2^1+1,2^2+5,2^3+21.... So the next no. is 2^4+85=341 ....

Like? Yes (1) | No (2)  

gunjan pathak   11 years AGO

1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341

Like? Yes (1) | No (2)  

saurabh tripathi   11 years AGO

1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341

Like? Yes (1) | No (2)  

Parveen Soni   11 years AGO

5-1=4 (4)
21-5=16(4*4)
85-21=64 (4*4*4)
85+ (4*4*4*4) =341
option 3

Like? Yes (1) | No (2)  

vishwajeetsingh   11 years AGO

let next number=x,5-1=4 ,4^2=16,16+5=21,4^3=64,64+21=85,4^4=256,256+85=341,so,x=341

Like? Yes (1) | No (2)  

Bharat Bhushan Jha   11 years AGO

2 nd term=1 st term*4+1

Like? Yes (1) | No (2)  

Chandni Maurya   11 years AGO

ans=341
series=> 1,5,21,85
1 + 4=5
5 + 4*4 = 5+16 = 21
21+16*4 = 21+64= 85
85+64*4 = 85+256= 341
next no =341

Like? Yes (1) | No (2)  

sandy   11 years AGO

85*4+1=341

Like? Yes (1) | No (2)  

ROHIT UPADHYAY   11 years AGO

1,(1*4)+1=5,(5*4)+1=21,(21*4)+1=85,(85*4)+1=341

Like? Yes (1) | No (2)  

ayush agarwal   11 years AGO

1*4 + 1=5
5*4 +1=21
21*4 + 1=85
85*4 + 1=341

Like? Yes (1) | No (2)  

PARVY GOVIL   11 years AGO

5-1=4
21-5=16(4*4)
85-21=64(16*4)
341-84=256(64*4)

Like? Yes (1) | No (2)  

thol   11 years AGO

every addition is the power of 4

Like? Yes (1) | No (2)  

Bupathikavya   11 years AGO

1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341
hence 1,5,21,85,341.

Like? Yes (1) | No (2)  

DHIRENDRA    11 years AGO

1+4==5
5+4^2=21
21+4^3=85
85+4^4=341

Like? Yes (1) | No (3)  

Yapadinne Raju   11 years AGO

5-1=4
21-5=16
85-21=64
?-85=256
then ans is 341

Like? Yes (1) | No (3)  

SONU GUPTA   11 years AGO

1
1*4+1=5
5*4+1=21
21*4+1=85
85*4+1=341

Like? Yes (1) | No (4)