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

Author

Alexandre Wajnberg, May 09 2005

Keywords

• easy
• nonn

Examples

			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.

Formula

A106547 with 0's removed.

Extensions

Corrected and extended by Ray Chandler, May 12 2005