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A133929 Positive integers that cannot be expressed using four pentagonal numbers. 0

%I

%S 9,21,31,43,55,89

%N Positive integers that cannot be expressed using four pentagonal numbers.

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

%Y Cf. A000326, A007527.

%K nonn,fini

%O 1,1

%A _Eric W. Weisstein_, Sep 29 2007

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Last modified June 1 19:32 EDT 2020. Contains 334762 sequences. (Running on oeis4.)