OFFSET
1,2
COMMENTS
Explicitly, for each b, the eight numbers b+1, b^2+1, b^4+1, b^8+1, b^16+1, b^32+1, b^64+1, and b^128+1 must be primes (generalized Fermat primes).
LINKS
Jeppe Stig Nielsen, Table of n, a(n) for n = 1..31 (found by Rob Gahan)
Yves Gallot, GFP (Generalized Fermat Progressions) / gfp8, software for calculating this sequence.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jeppe Stig Nielsen, Aug 25 2020
EXTENSIONS
a(10)-a(12) from Jeppe Stig Nielsen, Sep 04 2020
a(13) found by Rob Gahan added by Jeppe Stig Nielsen, Feb 15 2021
STATUS
approved