A106574 Indices n of perfect squares n^2 which are neither the sum nor the difference of two primes.

11, 17, 23, 25, 31, 41, 51, 53, 59, 65, 67, 73, 79, 83, 85, 87, 91, 95, 97, 101, 109, 113, 115, 125, 129, 133, 137, 141, 143, 149, 151, 153, 157, 159, 163, 165, 167, 175, 179, 181, 185, 187, 189, 193, 195, 197, 199, 201, 203, 207, 209, 213, 215, 221, 227, 229

Offset

1,1

Links

Table of n, a(n) for n=1..56.

Formula

a(n) = sqrt(A106573(n)).

Example

a(2)=17 because the second square which is nor the sum nor the difference of two primes (289=17^2) is the 17th one in the succession of the perfect squares (thus: index 17).

Crossrefs

Cf. A106544-A106548, A106562-A106564, A106571, A106573-A106575, A106577.

Sequence in context: A190039 A066074 A106563 * A171125 A156781 A175888

Adjacent sequences: A106571 A106572 A106573 * A106575 A106576 A106577

Keyword

easy,nonn

Author

Alexandre Wajnberg, May 09 2005

Extensions

Corrected and extended by Ray Chandler, May 12 2005

Status

approved