[seqfan] re puzzle - easy!
N. J. A. Sloane
njas at research.att.com
Mon Jul 26 03:09:01 CEST 2010
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[seqfan] Numbers n such that the decimal representation of n is contained as substring in that of the n-th pentagonal number.
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it seems pretty obvious that it is n(n+1) ( n(n+1)+1 ) ssorry for posting such a triviality! neil
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[seqfan] Numbers n such that the decimal representation of n is contained as substring in that of the n-th pentagonal number.
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