n such that A001372(n) is in A000040. n such that A124933(n) = 1, where A124933(n) = number of prime divisors (counted with multiplicity) of number of endofunctions on n points (A001372).

EXAMPLE

a(1) = 2 because number of endofunctions on 2 points A001372(2) = 3 is prime.

a(5) = 34 because A001372(34) = 767562358514099 is prime.

a(6) = 51 because A001372(51) = 62776430822871324190789 is prime.

CROSSREFS

Cf. A000040, A001372 = number of endofunctions on n points, A124933 = number of prime divisors (counted with multiplicity) of number of endofunctions on n points (A001372), A048888.