

A114816


Indices of Fibonacci numbers with 7 prime factors when counted with multiplicity.


2



30, 42, 56, 66, 70, 81, 104, 105, 136, 148, 152, 164, 175, 195, 207, 212, 244, 254, 259, 289, 291, 292, 298, 305, 319, 326, 332, 344, 365, 367, 403, 404, 423, 445, 447, 451, 458, 478, 489, 511, 517, 519, 526, 533, 537, 543, 554, 565, 566, 597, 605, 679, 681
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OFFSET

1,1


LINKS

Amiram Eldar, Table of n, a(n) for n = 1..112
Blair Kelly, Fibonacci and Lucas Factorizations.


EXAMPLE

a(1) = 30 because 30th Fibonacci number (i.e., 832040) consists of 7 prime factors (i.e., 2*2*2*5*11*31*61).


MATHEMATICA

t = {}; Do[f = FactorInteger[Fibonacci[n]]; If[Total[Transpose[f][[2]]] == 7, AppendTo[t, n]], {n, 2, 100}]; t (* T. D. Noe, Mar 14 2014 *)


PROG

(PARI) n=1; while(n<310, if(bigomega(fibonacci(n))==7, print1(n, ", ")); n++)


CROSSREFS

Cf. A000045.
Column k=7 of A303215.
Sequence in context: A097036 A090790 A090800 * A299991 A000977 A033992
Adjacent sequences: A114813 A114814 A114815 * A114817 A114818 A114819


KEYWORD

nonn


AUTHOR

Shyam Sunder Gupta, Feb 19 2006


EXTENSIONS

More terms from Ryan Propper, May 22 2006


STATUS

approved



