The series 1 6 10 13 15 (1+5=6; 6+4=10, 10+3=13; 13+2=15) is completed by 15+1=16. The answer is 16.
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10
This series is of the function f(x) = x2+1, starting with x=0.The next number in the series is 26. The number after that is 37.
10
44
44