A114840 Indices of Fibonacci numbers with 5 distinct prime factors.

30, 36, 42, 44, 45, 50, 57, 63, 66, 68, 69, 75, 76, 98, 111, 118, 124, 134, 141, 153, 169, 172, 183, 185, 201, 202, 203, 213, 218, 229, 247, 253, 267, 302, 303, 329, 335, 347, 363, 371, 373, 377, 381, 382, 386, 395, 398, 413, 415, 439, 443, 461

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..116 (terms 1..106 from Max Alekseyev)

Blair Kelly, Fibonacci and Lucas Factorizations.

Formula

{n: A022307(n)=5}. - R. J. Mathar, Nov 29 2015

Example

a(1)=30 because 30th fibonacci number consists of 5 distinct prime factors (i.e., 832040 = 2^3 * 5 * 11 * 31 * 61).

Prog

(PARI) n=1; while(n<305, if(omega(fibonacci(n))==5, print1(n, ", ")); n++)

Crossrefs

Cf. A114823-A114826, A114836-A114841.

Column k=5 of A303217.

Sequence in context: A138689 A257447 A257440 * A284787 A214408 A350353

Adjacent sequences: A114837 A114838 A114839 * A114841 A114842 A114843

Keyword

nonn

Author

Shyam Sunder Gupta, Feb 19 2006

Extensions

More terms from Ryan Propper, Apr 26 2006

a(56)-a(106) from Max Alekseyev, Aug 18 2013

Status

approved