A228512 Numbers n such that first n digits of A091725 (decimal expansion of second exponential integral at 1, ExpIntegralEi[1]) gives a prime number.

26, 63, 323, 784

Offset

1,1

Comments

a(5) > 10^4.

Links

Table of n, a(n) for n=1..4.

Eric Weisstein's World of Mathematics, Constant Primes

Eric Weisstein's World of Mathematics, Integer Sequence Primes

Crossrefs

Cf. A091725.

Sequence in context: A044016 A321023 A064867 * A250605 A020155 A063304

Adjacent sequences: A228509 A228510 A228511 * A228513 A228514 A228515

Keyword

nonn,more,base

Author

Robert Price, Aug 23 2013

Status

approved