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A115703 Pentagonal numbers (A000326) whose digit reversal is the product of 2 palindromes greater than 1. 0

%I #2 Mar 30 2012 17:40:35

%S 12,22,51,210,330,425,1162,2882,3876,4510,6902,8400,9801,14652,15251,

%T 22632,27270,29330,32340,52360,54055,55777,58707,66676,68587,104412,

%U 197472,217551,279720,298151,319935,341055,448540,468442,481950

%N Pentagonal numbers (A000326) whose digit reversal is the product of 2 palindromes greater than 1.

%e 14652 is the 99th pentagonal number and 25641=77*333.

%Y Cf. A000326, A115683.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Jan 31 2006

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Last modified August 24 23:28 EDT 2024. Contains 375418 sequences. (Running on oeis4.)