A038525 Numbers n with property that either the n-th Fibonacci number is prime or the concatenation of its prime factors is prime.

3, 4, 5, 7, 8, 11, 13, 17, 23, 24, 28, 29, 34, 43, 47, 50, 52, 58, 71, 77, 83, 131, 137, 163, 197, 235, 238, 319, 359, 431, 433, 449, 509, 569, 570, 571, 669, 949, 958, 1211, 1305

Offset: 1

Author

Jeff Burch

Keywords

• nonn
• base
• more

Comments

Up to and including a(17)=52, the sequence are the n such that A038526(n) is prime. Extrapolating, one would expect it to continue 83,86,93,95,131,137,139,174,182,... - R. J. Mathar, Oct 12 2007

Crossrefs

Cf. A000045, A037276, A038526.

Extensions

More terms from Thomas Baruchel, Oct 11 2003

More terms from Sean A. Irvine, Jan 16 2021