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URL: https://oeis.org/A046845

⇱ A046845 - OEIS

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A046845
Numbers k such that k*2^k + (k+1) is prime.
1
2, 38, 426, 978, 1530, 5268, 7238, 8384, 9696, 11930, 16164, 40502
OFFSET
1,1
COMMENTS
a(6) (if it exists) > 4000. - Hiroaki Yamanouchi, Sep 22 2014
a(13) > 200000. - Giovanni Resta, May 01 2016
MATHEMATICA
Select[Range[10^4], PrimeQ[#*2^# + (# + 1)] &] (* Michael De Vlieger, Mar 02 2015 *)
PROG
(PARI) for(n=1, 10^6, if(ispseudoprime(n*2^n+(n+1)), print1(n, ", "))); \\ Joerg Arndt, Mar 02 2015
CROSSREFS
Cf. A046844 (corresponding primes).
Sequence in context: A179503 A126731 A216357 * A098772 A207320 A262585
KEYWORD
nonn,hard,more
AUTHOR
EXTENSIONS
a(4)-a(5) from Hiroaki Yamanouchi, Sep 22 2014
New name from Hiroaki Yamanouchi, Sep 22 2014
a(6)-a(10) (pseudoprimes) from Joerg Arndt, Mar 02 2015
a(11)-a(12) (pseudoprimes) from Giovanni Resta, May 01 2016
STATUS
approved