A123240 Natural numbers with number of divisors not equal to a Fibonacci number.

6, 8, 10, 12, 14, 15, 18, 20, 21, 22, 26, 27, 28, 32, 33, 34, 35, 36, 38, 39, 44, 45, 46, 48, 50, 51, 52, 55, 57, 58, 60, 62, 63, 64, 65, 68, 69, 72, 74, 75, 76, 77, 80, 82, 84, 85, 86, 87, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 106, 108, 111, 112, 115, 116, 117, 118, 119, 120, 122, 123, 124, 125, 126, 129, 132, 133, 134, 140, 141, 142, 143, 144, 145, 146, 147, 148, 150, 153, 155, 156, 158, 159, 160, 161, 162, 164, 166, 168, 171, 172, 175, 176, 177, 178, 180, 183, 185, 187, 188, 192, 194, 196, 198, 200, 201, 202, 203, 204

Offset: 1

Author

Giovanni Teofilatto, Oct 07 2006

Keywords

• easy
• nonn

Comments

No prime or square of a prime or square of a prime's square is included in this sequence. [From Avik Roy (avik_3.1416(AT)yahoo.co.in), Jan 23 2009]

Links

• T. D. Noe, Table of n, a(n) for n=1..10000

Crossrefs

Complement of A123193. Different from A000379 (e.g. contains 180).

Programs

Mathematica

If[MemberQ[Fibonacci[Range[20]],DivisorSigma[0,#]],Nothing,#]&/@Range[250] (* Harvey P. Dale, Mar 18 2023 *)