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A103234 Numbers k such that the k-th Euler number (A122045(k)) is prime. 3
4, 6, 38, 454, 510 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Equals 2*A014547.

No others for n <= 69574 (Simon Plouffe). - Eric W. Weisstein, Aug 24 2020

LINKS

Table of n, a(n) for n=1..5.

Eric Weisstein's World of Mathematics, Euler Number

Eric Weisstein's World of Mathematics, Euler Number Prime

Eric Weisstein's World of Mathematics, Integer Sequence Primes

MATHEMATICA

Position[EulerE[Range[600]], _?PrimeQ] // Flatten

CROSSREFS

Cf. A000364, A014547, A122045 (EulerE), A092823.

Sequence in context: A092187 A092765 A056315 * A074061 A125081 A175349

Adjacent sequences:  A103231 A103232 A103233 * A103235 A103236 A103237

KEYWORD

nonn,hard,more

AUTHOR

Eric W. Weisstein, Jan 26 2005

STATUS

approved

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Last modified June 18 13:35 EDT 2021. Contains 345112 sequences. (Running on oeis4.)