A175319 Half-sums (averages) of two primes with indices that are primes with prime indices.

5, 8, 11, 18, 21, 31, 32, 35, 45, 59, 66, 69, 79, 92, 93, 95, 105, 119, 127, 141, 144, 153, 154, 168, 171, 179, 181, 195, 202, 218, 221, 228, 229, 231, 245, 255, 277, 279, 302, 304, 305, 315, 329, 331, 354, 357, 360, 363, 370, 381, 384, 389, 418, 431, 438, 444

Offset

1,1

Comments

The complement is A175320 which appears to be finite.

Computed at the suggestion of Jonathan Vos Post.

Links

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

Formula

(A038580(i) + A038580(j))/2

Crossrefs

Cf. A174681

Sequence in context: A314397 A314398 A314399 * A154486 A162612 A314400

Adjacent sequences: A175316 A175317 A175318 * A175320 A175321 A175322

Keyword

easy,nonn

Author

Jason Kimberley, Apr 04 2010

Status

approved