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A263874
Integers for which the smallest k in A067760 such that n + 2^k is prime increases.
3
1, 7, 23, 31, 47, 61, 139, 271, 287, 773, 2131, 40291
OFFSET
1,2
PROG
(PARI) a=1; forstep(n=1, 773, 2, k=1; while(!ispseudoprime(n+2^k), k++); if(k+1>a, print1(n, ", "); a=k+1));
CROSSREFS
A263875 gives the record values.
Sequence in context: A036259 A004628 A089199 * A014663 A007522 A141175
KEYWORD
nonn,hard,more
AUTHOR
STATUS
approved