OFFSET

1,2

COMMENTS

LINKS

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

KEYWORD

nonn

AUTHOR

Thomas M. Bridge, Nov 15 2013

EXTENSIONS

Edited by Ralf Stephan, Feb 28 2014

STATUS

approved