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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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
KEYWORD
nonn
AUTHOR
Shyam Sunder Gupta, Feb 19 2006
EXTENSIONS
More terms from Ryan Propper, May 22 2006
STATUS
approved

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Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)