A176986 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

FORMULA

{k: A001043(k) in A014574}.

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