A106573 Perfect squares which are neither the sum nor the difference of two primes.

121, 289, 529, 625, 961, 1681, 2601, 2809, 3481, 4225, 4489, 5329, 6241, 6889, 7225, 7569, 8281, 9025, 9409, 10201, 11881, 12769, 13225, 15625, 16641, 17689, 18769, 19881, 20449, 22201, 22801, 23409, 24649, 25281, 26569, 27225, 27889, 30625

Offset

1,1

Links

Table of n, a(n) for n=1..38.

Formula

A106547 with 0's removed.

Example

a(2)=289 because it is the second perfect square which is impossible to obtain adding a prime to - or subtracting from - another one. 64 is not in the sequence because 64=67-3, a difference of two primes.

Crossrefs

Cf. A106544-A106548, A106562-A106564, A106571, A106574, A106575, A106577.

Sequence in context: A023696 A038467 A106562 * A084306 A254978 A254971

Adjacent sequences: A106570 A106571 A106572 * A106574 A106575 A106576

Keyword

easy,nonn

Author

Alexandre Wajnberg, May 09 2005

Extensions

Corrected and extended by Ray Chandler, May 12 2005

Status

approved