a(n) = 1 if n is a triangular number else 0.
1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0
3 seqfan posts
Wed Jun 29 20:52:14 CEST 2011 [seqfan] Re: Formulas needed for new sequence.
Wed Jun 29 10:27:34 CEST 2011 [seqfan] Re: Formulas needed for new sequence.
Wed Jun 29 10:25:44 CEST 2011 [seqfan] Re: Formulas needed for new sequence.
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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