Heptagonal numbers (or 7-gonal numbers): n(5n-3)/2.
0, 1, 7, 18, 34, 55, 81, 112, 148, 189, 235, 286, 342, 403, 469, 540, 616, 697, 783
4 seqfan posts
Sat May 1 17:30:24 CEST 2010 [seqfan] Re: A possible list of new sequences
Sat May 1 15:12:55 CEST 2010 [seqfan] Re: A possible list of new sequences
Sat May 1 13:12:04 CEST 2010 [seqfan] A possible list of new sequences
Mon Jan 12 11:27:00 CET 2009 [seqfan] Re: Index of linear recurrences
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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