

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
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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


REFERENCES

C. Armana, Coefficients of Drinfeld modular forms and Hecke operators, Journal of Number Theory 131 (2011), 14351460.


LINKS

Table of n, a(n) for n=1..36.
C. Armana, Coefficients of Drinfeld modular forms and Hecke operators


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



