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A133929 Positive integers that cannot be expressed using four pentagonal numbers. 0
9, 21, 31, 43, 55, 89 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..6.

Eric Weisstein's World of Mathematics, Pentagonal Number

CROSSREFS

Cf. A000326, A007527.

Sequence in context: A173460 A110701 A243703 * A086470 A176256 A017629

Adjacent sequences:  A133926 A133927 A133928 * A133930 A133931 A133932

KEYWORD

nonn,fini

AUTHOR

Eric W. Weisstein, Sep 29 2007

STATUS

approved

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Last modified June 24 15:07 EDT 2017. Contains 288697 sequences.