A014547 -id:A014547 - cp's OEIS frontend

A103234 Numbers k such that the k-th Euler number (A122045(k)) is prime.

4, 6, 38, 454, 510

Offset: 1

Eric W. Weisstein, Jan 26 2005

Equals 2*A014547.
No others for k <= 69574 (Simon Plouffe). - Eric W. Weisstein, Aug 24 2020
No others for k <= 112130 (Simon Plouffe). - Eric W. Weisstein, Apr 15 2024

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

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

Position[EulerE[Range[600]], _?PrimeQ] // Flatten
Select[Range[600], PrimeQ @* EulerE] (* Eric W. Weisstein, Apr 12 2024 *)

A092823 Euler numbers whose absolute value is prime.

Original entry on oeis.org

5, -61, -23489580527043108252017828576198947741

Offset: 1

Eric W. Weisstein, Mar 06 2004

The next terms are known to be A122045(454) and A122045(510), but are too big to include (see A103234).

Amiram Eldar, Table of n, a(n) for n = 1..4
Eric Weisstein's World of Mathematics, Euler Number.
Eric Weisstein's World of Mathematics, Euler Number Prime.

Cf. A000364, A014547, A103234, A122045.

a(n) = A122045(A103234(n)). - Amiram Eldar, Aug 26 2025

Definition edited by N. J. A. Sloane, Sep 08 2020

cp's OEIS Frontend

A103234 Numbers k such that the k-th Euler number (A122045(k)) is prime.

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