

A050413


Numbers n such that 74*2^n1 is prime.


2




OFFSET

1,2


REFERENCES

Computed by Joe K. Crump (joecr(AT)carolina.rr.com) and (mostly) by David Broadhurst.


LINKS

Table of n, a(n) for n=1..7.
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
Wilfrid Keller, List of primes k.2^n  1 for k < 300
Index entries for sequences of n such that k*2^n1 (or k*2^n+1) is prime


PROG

(PARI) is(n)=ispseudoprime(74*2^n1) \\ Charles R Greathouse IV, May 22 2017


CROSSREFS

Cf. A050412, A050544.
Sequence in context: A250686 A035876 A072435 * A050544 A185516 A235085
Adjacent sequences: A050410 A050411 A050412 * A050414 A050415 A050416


KEYWORD

nonn,hard


AUTHOR

David Broadhurst, Dec 22 1999


EXTENSIONS

David Broadhurst, Dec 26 1999 reports that primality up to n=51476 is now proved, using Yves Gallot's proth.exe.


STATUS

approved



