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Search: id:A073216
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| A073216 |
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The terms of A055235 (sums of two powers of 3) divided by 2. |
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+0
3
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| 1, 2, 3, 5, 6, 9, 14, 15, 18, 27, 41, 42, 45, 54, 81, 122, 123, 126, 135, 162, 243, 365, 366, 369, 378, 405, 486, 729, 1094, 1095, 1098, 1107, 1134, 1215, 1458, 2187
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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n such that 3 is the largest power of 3 dividing binomial(3n,n). - Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 01 2004
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FORMULA
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(3^n + 3^m) / 2, n = 0, 1, 2, 3 ..., m = 0, 1, 2, 3, ... n.
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EXAMPLE
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a(4) = 5 = (3^2+3^0) / 2
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CROSSREFS
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Cf. A055235.
Equals A023745 + 1.
A023745.
Sequence in context: A018126 A087900 A101216 this_sequence A059454 A138538 A102694
Adjacent sequences: A073213 A073214 A073215 this_sequence A073217 A073218 A073219
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KEYWORD
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easy,nonn
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AUTHOR
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Jeremy Gardiner (jeremy.gardiner(AT)btinternet.com), Jul 21 2002
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