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A175320 Positive integers which cannot be represented as half-sums (averages) of two primes with indices that are primes with prime indices. 3
1, 2, 3, 4, 6, 7, 9, 10, 12, 13, 14, 15, 16, 17, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 33, 34, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 67, 68, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Appears to be finite with the last term being a(1578727)=161352166. If a(1578728) exists, it is greater than 10^9.

The (apparently) last 19 terms are listed in A175321.

Computed at the suggestion of Jonathan Vos Post.

LINKS

J. S. Kimberley, Table of n, a(n) for n=1..1578727

FORMULA

The complement of A175319.

CROSSREFS

Cf. A174682.

Sequence in context: A047301 A186275 A214857 * A325597 A001953 A230748

Adjacent sequences:  A175317 A175318 A175319 * A175321 A175322 A175323

KEYWORD

nonn

AUTHOR

Jason Kimberley, Apr 04 2010

STATUS

approved

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Last modified August 6 00:46 EDT 2021. Contains 346493 sequences. (Running on oeis4.)