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

Offset: 1

Author

Thomas M. Bridge, Nov 15 2013

Keywords

• nonn

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

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

Crossrefs

Cf. A029744.

Programs

Sage

def is_in_A231960(n):
    return 6.divides(n) or n==3^valuation(n,3)

Extensions

Edited by Ralf Stephan, Feb 28 2014