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A103234
Numbers k such that the k-th Euler number (
A122045
(k)) is prime.
3
4, 6, 38, 454, 510
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OFFSET
1,1
COMMENTS
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
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
Select[Range[600], PrimeQ @* EulerE] (*
Eric W. Weisstein
, Apr 12 2024 *)
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
,
changed
AUTHOR
Eric W. Weisstein
, Jan 26 2005
STATUS
approved
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Last modified April 25 16:45 EDT 2024. Contains 371989 sequences. (Running on oeis4.)