login
A119885
Natural numbers with number of divisors equal to a Lucas number.
3
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 17, 19, 21, 22, 23, 25, 26, 27, 29, 31, 33, 34, 35, 37, 38, 39, 41, 43, 46, 47, 49, 51, 53, 55, 57, 58, 59, 61, 62, 64, 65, 67, 69, 71, 73, 74, 77, 79, 82, 83, 85, 86, 87, 89, 91, 93, 94, 95, 97, 101, 103
OFFSET
1,2
LINKS
MATHEMATICA
lim = 250; t = LucasL /@ Range[0, lim]; Select[Range@ lim, MemberQ[t, DivisorSigma[0, #]] &] (* Amiram Eldar, Sep 05 2019 after Michael De Vlieger at A123193 *)
CROSSREFS
For natural numbers with number of divisors equal to a Fibonacci number, see A123193. [corrected by Matthew Vandermast, Oct 29 2008]
Cf. A000032.
Sequence in context: A329481 A261355 A084384 * A007964 A095135 A135402
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Aug 01 2006
STATUS
approved