A176986 Numbers k such that the k-th sum of two successive primes is a twin prime average.

3, 4, 6, 8, 10, 19, 25, 30, 50, 62, 63, 79, 80, 85, 112, 117, 120, 127, 131, 140, 145, 149, 159, 175, 177, 217, 235, 261, 264, 289, 303, 309, 319, 320, 333, 335, 373, 382, 394, 401, 402, 410, 436, 442, 446, 456, 462, 469, 471, 476, 477, 487, 513, 525, 527, 537

Offset: 1

Author

Juri-Stepan Gerasimov, Apr 30 2010

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A001043, A001359, A014574.

Programs

Maple

A001043 := proc(n) ithprime(n)+ithprime(n+1) ; end proc:
A014574 := proc(n) (A001359(n)+A006512(n))/2 ; end proc:
isA014574 := proc(n) local k ; for k from 1 do av := A014574(k) ; if av> n then return false; elif av=n then return true; end if; end do; end proc:
for n from 1 to 800 do if isA014574(A001043(n) ) then printf("%d,",n) ; end if; end do: # R. J. Mathar, Apr 30 2010

Formula

{k: A001043(k) in A014574}.

Extensions

Corrected (95 replaced by 85, 394 inserted) and extended by R. J. Mathar, Apr 30 2010