A113651 2*JacobiSymbol(p,5) mod p^2 for p=prime(n).

2, 7, 0, 47, 2, 167, 287, 2, 527, 2, 2, 1367, 2, 1847, 2207, 2807, 2, 2, 4487, 2, 5327, 2, 6887, 2, 9407, 2, 10607, 11447, 2, 12767, 16127, 2, 18767, 2, 2, 2, 24647, 26567, 27887, 29927, 2, 2, 2, 37247, 38807, 2, 2, 49727, 51527, 2, 54287, 2, 2, 2, 66047

Offset: 1

Author

Eric W. Weisstein, Nov 03 2005

Keywords

• nonn

Links

• Eric Weisstein's World of Mathematics, Wall-Sun-Sun Prime

Programs

PARI

a(n) = my(p=prime(n)); 2*kronecker(p, 5) % p^2; \\ Michel Marcus, Aug 03 2014