A278637 - OEIS

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A278637

Numbers k such that Fibonacci(k) is either prime or semiprime.

3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 17, 19, 22, 23, 26, 29, 31, 34, 41, 43, 47, 53, 59, 61, 71, 73, 79, 83, 89, 94, 101, 107, 109, 113, 121, 127, 131, 137, 151, 167, 173, 191, 193, 199, 227, 251, 271, 277, 293, 331, 353, 359, 397, 401, 431, 433, 449, 467, 509, 569, 571, 587, 599, 601, 613, 631, 653, 743, 991, 1091, 1223, 1373, 1487

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OFFSET

1,1

COMMENTS

Numbers k such that 2 <= A063375(k) <= 4.

All numbers in the first 4 rows of A279021 are in this sequence (3, 5, 11, 17, 353, 431, 509, and 587).

Are all numbers of A279021 in this sequence?

LINKS

Table of n, a(n) for n=1..73.

FORMULA

A001605 U A072381.

CROSSREFS