|
| |
|
|
A110932
|
|
Numbers n such that 2*n^n+1 is prime.
|
|
11
|
| |
|
|
|
OFFSET
|
0,3
|
|
|
COMMENTS
|
As a "list of numbers such that ...", the sequence should have offset 1, but to preserve validity of formulas referring to this sequence, the offset was set to 0 when the initial value a(0)=0 was added. - M. F. Hasler, Sep 02 2012
|
|
|
LINKS
|
Table of n, a(n) for n=0..5.
|
|
|
MATHEMATICA
|
Join[{0}, Select[Range[1000], PrimeQ[2*#^# + 1] &]] (* Robert Price, Mar 27 2019 *)
|
|
|
PROG
|
(PARI) is_A110932(n)=ispseudoprime(n^n*2+1) \\ - M. F. Hasler, Sep 02 2012
|
|
|
CROSSREFS
|
Cf. A110931, A121270 (= primes in A014566), A088790, A160360, A160600.
The primes 2n^n+1, for k<4, n=a(k)<251, are listed at A216148(k) = A216147(a(k)). - M. F. Hasler, Sep 02 2012
Sequence in context: A018957 A238922 A212128 * A112880 A211083 A100541
Adjacent sequences: A110929 A110930 A110931 * A110933 A110934 A110935
|
|
|
KEYWORD
|
more,nonn,hard
|
|
|
AUTHOR
|
Ray G. Opao, Sep 25 2005
|
|
|
EXTENSIONS
|
a(5) from Serge Batalov, Apr 08 2018
|
|
|
STATUS
|
approved
|
| |
|
|
