A225388 Prime powers (A025475) representable as (p+q)/2, where p and q are distinct prime powers.

25, 125, 169, 243, 256, 289, 625, 841, 1369, 1681, 2809, 3125, 3721, 5329, 9409, 11881, 12769, 18769, 22201, 28561, 37249, 38809, 54289, 76729, 83521, 100489, 113569, 151321, 160801, 196249, 201601, 208849, 292681, 323761, 375769, 390625, 410881, 426409, 452929, 502681

Offset: 1

Author

Alex Ratushnyak, May 05 2013

Keywords

• nonn

Examples

			a(1) = 25 = (1 + 49) / 2.
a(2) = 125 = (81 + 169) / 2.
a(3) = 169 = (49 + 289) / 2.
a(4) = 243 = (125 + 361) / 2.
a(5) = 256 = (169 + 343) / 2.
a(6) = 289 = (49 + 529) / 2.
		

Crossrefs

Cf. A025475, A225389.