The OEIS mourns the passing of
Jim Simons
and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The OnLine Encyclopedia of Integer Sequences
!)
A081510
Numbers n such that 1+2^n+4^n+6^n is prime.
1
1, 11, 23, 59, 399
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..5.
EXAMPLE
m=1: 1+2+4+6=13 prime.
MATHEMATICA
Do[s=1^w+2^w+4^w+6^w; If[IntegerQ[w/100], Print[{w}]]; If[PrimeQ[s], Print[{w, s}]], {w, 0, 1000}]
Select[Range[400], PrimeQ[2^#+4^#+6^#+1]&] (*
Harvey P. Dale
, Jun 03 2023 *)
PROG
(PARI) is(n)=ispseudoprime(1+2^n+4^n+6^n) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Cf.
A081509
.
Sequence in context:
A105967
A097473
A366487
*
A068844
A139905
A267437
Adjacent sequences:
A081507
A081508
A081509
*
A081511
A081512
A081513
KEYWORD
more
,
nonn
AUTHOR
Labos Elemer
, Apr 15 2003
STATUS
approved
Lookup

Welcome

Wiki

Register

Music

Plot 2

Demos

Index

Browse

More

WebCam
Contribute new seq. or comment

Format

Style Sheet

Transforms

Superseeker

Recents
The OEIS Community
 Maintained by
The OEIS Foundation Inc.
License Agreements, Terms of Use, Privacy Policy.
.
Last modified May 28 00:20 EDT 2024. Contains 372900 sequences. (Running on oeis4.)