A136346 -id:A136346

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A136345

Sums of exactly two positive octagonal numbers A000567.

+10
1

2, 9, 16, 22, 29, 41, 42, 48, 61, 66, 73, 80, 86, 97, 104, 105, 117, 130, 134, 136, 141, 154, 161, 173, 177, 184, 192, 197, 198, 216, 226, 229, 233, 241, 246, 265, 266, 272, 281, 288, 290, 301, 309, 320, 321, 342, 345, 349, 352, 358, 362, 376, 381, 401, 406, 409

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OFFSET

1,1

COMMENTS

For octagonal numbers within this sequence, see: A136346. This is to octagonal numbers A000567 as A051533 is to triangular numbers A000217 and as A000404 is to squares A000290 and as A117104 is to heptagonal numbers A000566.

LINKS

Table of n, a(n) for n=1..56.

Eric Weisstein's World of Mathematics, Octagonal Number.

FORMULA

{A000567(i) + A000567(j), i, j > 0}. {i*(3*i-2) + j(3*j-2), i, j > 0}.

CROSSREFS

Cf. A000567, A136117, A136346.

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post, Dec 25 2007

EXTENSIONS

Missing term (80) from Giovanni Resta, Jun 19 2016

STATUS

approved

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