A061888 Numbers k such that k^2 is the sum of the first m primes for some m.
10, 5063, 14573, 17098, 1916357, 468726713734
Offset: 1
Examples
10^2 = 2+3+5+7+11+13+17+19+23, so 10 is in the sequence.
Links
- G. L. Honaker Jr. and C. Caldwell, Prime Curios!: 9
- Carlos Rivera, Problem 9: Sum of first k primes is perfect square, The Prime Puzzles and Problems Connection.
Formula
a(n)^2 = A061890(n).
Extensions
a(6) from Giovanni Resta, May 27 2003
Edited by Ray Chandler, Mar 20 2007