A119885 Natural numbers with number of divisors equal to a Lucas number.

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

Amiram Eldar, Table of n, a(n) for n = 1..10000

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

Adjacent sequences: A119882 A119883 A119884 * A119886 A119887 A119888

Keyword

easy,nonn

Author

Giovanni Teofilatto, Aug 01 2006

Status

approved