A154786 Row sums of triangle in A154725.

0, 0, 0, 8, 10, 12, 14, 32, 36, 40, 44, 72, 52, 56, 90, 64, 102, 144, 38, 120, 168, 132, 138, 240, 200, 156, 270, 168, 174, 360, 124, 320, 396, 136, 350, 432, 296, 380, 546, 320, 328, 672, 344, 352, 810, 368, 376, 672, 294, 600, 816, 520, 530, 864, 660, 784, 1140

Offset

1,4

Links

Table of n, a(n) for n=1..57.

Formula

a(n) = A154785(n) - n.

a(n) = A005843(n)*A061357(n). - Omar E. Pol, Jan 20 2009

Maple

A154786 := proc(n) local a, d; a := 0 ; for d from 1 to n-2 do if isprime(n-d) and isprime(n+d) then a := a+2*n; fi; od: a ; end: for n from 1 to 80 do printf("%d, ", A154786(n)) ; od: # R. J. Mathar, Jan 18 2009

Crossrefs

Cf. A154724, A154725, A154726, A154727, A154783, A154784, A154785.

Cf. A005843, A061357, A154720, A154787. - Omar E. Pol, Jan 20 2009

Sequence in context: A161425 A096171 A337252 * A335013 A249628 A352169

Adjacent sequences: A154783 A154784 A154785 * A154787 A154788 A154789

Keyword

easy,nonn

Author

Omar E. Pol, Jan 15 2009, Jan 16 2009

Extensions

Edited by Omar E. Pol, Jan 17 2009

Extended by R. J. Mathar, Jan 18 2009

Status

approved