next number after series 1,5,5,3,10,10,5,6,......

• 1^2=1
  1^2+2^2=1+4=5
  1^2+2^2+3^2=1+4+9=14=1+4=5
  1^2+2^2+3^2+4^2=1+4+9+16=30=3+0=3
  1^2+2^2+3^2+4^2+5^2=1+4+9+16+25=55=5+5=10
  1^2+2^2+3^2+4^2+5^2+6^2=91=9+1=10
  1^2+2^2+3^2+4^2+5^2+6^2+7^2=140=1+4+0=5
  1^2+2^2+3^2+4^2+5^2+6^2+7^2+8^2=204=2+0+4=6
  1^2+2^2+3^2+4^2+5^2+6^2+7^2+8^2+9^2=285=2+8+5=15
  answer is 15
  
• 11 years agoHelpfull: Yes(15) No(4)
• 1,5,5,3,10,10,5,6,6,7,3,3,9,1,1
• 10 years agoHelpfull: Yes(3) No(0)
• 25 series like 1 3 6 and 5 5 10 10 5
• 11 years agoHelpfull: Yes(1) No(1)
• 
  
  It's combined serie first is 1, 5, 10, 5, 1, 5, 10, 5, ... and so on. Second is 5, 3, 10, 6, 20, 12, 40, 24, ... and so on, so the first pattern is repeated 1, 5, 10, 5. Second pattern is duplicate.. So the series became 1, 5, 5, 3, 10, 10, 5, 6, 1, 20, 5, 12, 10, 40, 5, 24, 1, ....
• 11 years agoHelpfull: Yes(0) No(2)
• 1,5,5,3,10,10,5,6,6,7
• 11 years agoHelpfull: Yes(0) No(0)
• 1,5,5,3,10.10,5,6,15,15
• 10 years agoHelpfull: Yes(0) No(0)