A117551 Indices of Fibonacci numbers with 15 distinct prime factors.

180, 210, 276, 280, 288, 312, 320, 340, 342, 416, 464, 476, 486, 516, 558, 564, 651, 665, 676, 708, 730, 735, 752, 776, 783, 837, 848, 856, 890, 992, 999, 1030, 1034, 1038, 1065, 1068, 1071, 1095, 1125, 1130, 1192, 1212

Offset: 1

Author

Ryan Propper, Apr 26 2006

Keywords

• hard
• more
• nonn

Examples

			F(180) = 2^4 * 3^3 * 5 * 11 * 17 * 19 * 31 * 41 * 61 * 107 * 181 * 541 * 2521 * 109441 * 10783342081 has 15 distinct prime factors, so 180 is in the sequence.
		

Links

• Blair Kelly, Fibonacci and Lucas Factorizations.

Crossrefs

Cf. A114823-A114826, A114836-A114841.

Column k=15 of A303217.

Programs

PARI

isok(n) = (omega(fibonacci(n)) == 15) \\ Michel Marcus, Jun 28 2013

Extensions

a(32)-a(42) from Max Alekseyev, Aug 18 2013