A231960 - OEIS

A231960

Powers of 3 together with multiples of 6.

1, 3, 6, 9, 12, 18, 24, 27, 30, 36, 42, 48, 54, 60, 66, 72, 78, 81, 84, 90, 96, 102, 108, 114, 120, 126, 132, 138, 144, 150, 156, 162, 168, 174, 180, 186, 192, 198, 204, 210, 216, 222, 228, 234, 240, 243, 246, 252, 258

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OFFSET

1,2

COMMENTS

Union of A000244 and A008588 (without 0).

Also, 1 and 3*(even numbers (A005843) UNION powers of 3 (A008588)).

Also, numbers m such that m divides A057083(m-1), see the Smyth reference.

LINKS

Table of n, a(n) for n=1..49.

C. Smyth, The Terms in Lucas Sequences Divisible by their Indices, Journal of Integer Sequences, Vol.13 (2010), Article 10.2.4.

PROG

(Sage) def is_in_A231960(n):

return 6.divides(n) or n==3^valuation(n, 3)

CROSSREFS

Cf. A029744.

Sequence in context: A253277 A310155 A310156 * A052287 A156997 A063996

Adjacent sequences: A231957 A231958 A231959 * A231961 A231962 A231963

KEYWORD

nonn

AUTHOR

Thomas M. Bridge, Nov 15 2013

EXTENSIONS

Edited by Ralf Stephan, Feb 28 2014

STATUS

approved