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A136345 Sums of exactly two positive octagonal numbers A000567. 1

%I #7 Jun 19 2016 15:00:13

%S 2,9,16,22,29,41,42,48,61,66,73,80,86,97,104,105,117,130,134,136,141,

%T 154,161,173,177,184,192,197,198,216,226,229,233,241,246,265,266,272,

%U 281,288,290,301,309,320,321,342,345,349,352,358,362,376,381,401,406,409

%N Sums of exactly two positive octagonal numbers A000567.

%C 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.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/OctagonalNumber.html">Octagonal Number</a>.

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

%Y Cf. A000567, A136117, A136346.

%K easy,nonn

%O 1,1

%A _Jonathan Vos Post_, Dec 25 2007

%E Missing term (80) from _Giovanni Resta_, Jun 19 2016

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Last modified July 4 20:10 EDT 2024. Contains 374016 sequences. (Running on oeis4.)