A228507 Numbers n such that first n digits of A091723 (Decimal expansion of the root x of ExpIntegralEi[x]==0) gives a prime number.

1, 2, 145, 180, 691, 4123

Offset

1,2

Comments

a(7) > 10^4.

Links

Table of n, a(n) for n=1..6.

Eric Weisstein's World of Mathematics, Constant Primes

Eric Weisstein's World of Mathematics, Integer Sequence Primes

Crossrefs

Cf. A091723.

Sequence in context: A074319 A188284 A306955 * A254499 A071064 A265442

Adjacent sequences: A228504 A228505 A228506 * A228508 A228509 A228510

Keyword

nonn,more,less,base

Author

Robert Price, Aug 23 2013

Status

approved