A050809 Primes of the form floor( exp(n) ).

2, 7, 65659969, 5184705528587072464087, 14302079958348104463583671072905261080748384225250684971, 17199742630376622641833783925547830057256484050709158699244513

Offset

1,1

Links

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

Eric Weisstein's World of Mathematics, e-Prime

Example

a(3) = floor(e^18) = 65659969, which is prime.

Mathematica

Select[Table[Floor[Exp[n]], {n, 150}], PrimeQ] (* Jayanta Basu, Jun 01 2013 *)

Crossrefs

Cf. A050808 (values of n), A000149, A040016, A037028, A000227, A004791.

Sequence in context: A152181 A153089 A077548 * A246516 A095217 A230915

Adjacent sequences: A050806 A050807 A050808 * A050810 A050811 A050812

Keyword

nonn,hard

Author

Patrick De Geest, Oct 15 1999

Extensions

Corrected by Naohiro Nomoto, Feb 22 2001

Status

approved