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A154786 Row sums of triangle in A154725. 6
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
LINKS
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. A005843, A061357, A154720, A154787. - Omar E. Pol, Jan 20 2009
Sequence in context: A161425 A096171 A337252 * A335013 A249628 A352169
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

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Last modified July 15 11:27 EDT 2024. Contains 374332 sequences. (Running on oeis4.)