OFFSET
0,1
EXAMPLE
First in the suitable neighborhood of 2^25 no primes occur: a[0]=25, while corresponding around 2^127 6 primes arise: a[6]=127.
MATHEMATICA
t=Table[Count[Table[PrimeQ[2^n+i], {i, -Ceiling[Log[2^n]//N], Ceiling[Log[2^n]//N]}], True], {n, 1, 256}] Table[Min[Flatten[Position[t, j]]], {j, 0, 10}]
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Labos Elemer, Jul 12 2004
STATUS
approved