

A225838


Numbers of form 2^i*3^j*(6k+5), i, j, k >= 0.


6



5, 10, 11, 15, 17, 20, 22, 23, 29, 30, 33, 34, 35, 40, 41, 44, 45, 46, 47, 51, 53, 58, 59, 60, 65, 66, 68, 69, 70, 71, 77, 80, 82, 83, 87, 88, 89, 90, 92, 94, 95, 99, 101, 102, 105, 106, 107, 113, 116, 118, 119, 120, 123, 125, 130, 131, 132, 135, 136, 137, 138
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OFFSET

1,1


COMMENTS

Are a(n) > A225837(n) for all n?  Zak Seidov, May 17 2013
The asymptotic density of this sequence is 1/2.  Amiram Eldar, Apr 03 2022


LINKS

Zak Seidov, Table of n, a(n) for n = 1..10000
Zak Seidov, Graph of A225838(n)  A225837(n) for n=1..126454.


MATHEMATICA

mx = 153; t = {}; Do[n = 2^i*3^j (6 k + 5); If[n <= mx, AppendTo[t, n]], {i, 0, Log[2, mx]}, {j, 0, Log[3, mx]}, {k, 0, mx/6}]; Union[t] (* T. D. Noe, May 16 2013 *)


PROG

(PARI) for(n=1, 200, t=n/(2^valuation(n, 2)*3^valuation(n, 3)); if((t%6==5), print1(n, ", ")))
(Magma) [n: n in [1..200]  d mod 6 eq 5 where d is n div (2^Valuation(n, 2)*3^Valuation(n, 3))]; // Bruno Berselli, May 16 2013


CROSSREFS

Inverse of A225837.
Sequence in context: A297132 A136823 A275200 * A036788 A351327 A136811
Adjacent sequences: A225835 A225836 A225837 * A225839 A225840 A225841


KEYWORD

nonn,easy


AUTHOR

Ralf Stephan, May 16 2013


STATUS

approved



