A114838 Indices of Fibonacci numbers with 7 distinct prime factors.

70, 81, 104, 105, 136, 148, 152, 164, 182, 186, 195, 207, 212, 244, 246, 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, 685, 698, 699, 701, 721, 723, 725, 737, 745, 746, 749, 753, 758, 766, 767, 785, 813, 817, 831, 842, 871, 879, 901, 905, 914, 955, 967, 973, 985, 998, 1006, 1007, 1009, 1043, 1046, 1051, 1133, 1139, 1159, 1167, 1174, 1175, 1177, 1191, 1199, 1207, 1219

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..112

Blair Kelly, Fibonacci and Lucas Factorizations.

Example

a(1)=70 because 70th fibonacci number consists of 7 distinct prime factors (i.e. 190392490709135 = 5 x 11 x 13 x 29 x 71 x 911 x 141961)

Mathematica

Select[Range[1220], PrimeNu[Fibonacci[#]]==7&] (* Harvey P. Dale, Sep 18 2020 *)

Prog

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

Crossrefs

Cf. A114823-A114826, A114836-A114841.

Column k=7 of A303217.

Sequence in context: A118216 A256082 A345487 * A036191 A165632 A295807

Adjacent sequences: A114835 A114836 A114837 * A114839 A114840 A114841

Keyword

nonn

Author

Shyam Sunder Gupta, Feb 19 2006

Extensions

More terms from Ryan Propper, Apr 26 2006

a(53)-a(98) from Max Alekseyev, Aug 18 2013

Status

approved