OFFSET
1,1
COMMENTS
Different version of A240235. Some authors, like Caldwell (link), require that k + 2 > n before they use the term generalized Woodall for a prime of form k*n^k - 1.
LINKS
Jeppe Stig Nielsen, Table of n, a(n) for n = 1..144
Chris K. Caldwell, The Top Twenty: Generalized Woodall.
EXAMPLE
To find a(11), consider numbers k*11^k - 1 where k > 9. The first time it is prime, is for k = 252, so a(11) = 252.
PROG
(PARI) for(b=1, +oo, for(k=b-1, +oo, if(ispseudoprime(k*b^k-1), print1(k, ", "); next(2))))
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Jeppe Stig Nielsen, Sep 21 2019
STATUS
approved