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A154998
Primes p such that p^2 divides A048861((p-1)/2).
1
3, 2001907169
OFFSET
1,1
COMMENTS
No other terms below 10^11.
FORMULA
Elements of A125854 congruent to 1 or 3 modulo 8, i.e., primes p such that p == 1 or 3 (mod 8) and 2^(p-1) == 1+p (mod p^2).
PROG
(PARI) { forprime(p=3, 10^11, if(Mod((p-1)/2, p^2)^((p-1)/2)==1, print(p); )) }
CROSSREFS
KEYWORD
bref,hard,more,nonn
AUTHOR
Max Alekseyev, Jan 18 2009
EXTENSIONS
Edited by Max Alekseyev, Oct 13 2009
STATUS
approved