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 A073216 The terms of A055235 (sums of two powers of 3) divided by 2. 2
 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; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS n such that 3 is the largest power of 3 dividing binomial(3n,n). - Benoit Cloitre, Jan 01 2004 Equals A023745 + 1. This sequence is A007051 together with its (successive) multiples by (powers of) 3. - R. K. Guy, Oct 08 2011 LINKS C. Armana, Coefficients of Drinfeld modular forms and Hecke operators, Journal of Number Theory 131 (2011), 1435-1460. FORMULA (3^n + 3^m) / 2, n = 0, 1, 2, 3 ..., m = 0, 1, 2, 3, ... n. EXAMPLE a(4) = 5 = (3^2+3^0) / 2. CROSSREFS Cf. A055235, A007051, A023745. Sequence in context: A087900 A101216 A175095 * A181902 A295631 A278707 Adjacent sequences:  A073213 A073214 A073215 * A073217 A073218 A073219 KEYWORD easy,nonn AUTHOR Jeremy Gardiner, Jul 21 2002 EXTENSIONS Edited by Jeremy Gardiner, Oct 08 2011 STATUS approved

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Last modified May 10 16:34 EDT 2021. Contains 343775 sequences. (Running on oeis4.)