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A212290
Difference between the smallest 10^n-bit prime and 2^(10^n-1).
0
9, 255, 1239, 5895, 221961
OFFSET
1,1
COMMENTS
a(5) found by Serge Batalov, Jun 11 2012.
LINKS
Henri Lifchitz, Renaud Lifchitz, Probable Primes Top 10000.
EXAMPLE
2^99+255 is the smallest 100-bit prime, 2^999+1239 is the smallest 1000-bit prime, etc.
PROG
(PARI) a(n)=nextprime(2^(10^n-1))-2^(10^n-1)
CROSSREFS
Binary analog of A096548.
Sequence in context: A345160 A178186 A348861 * A296950 A025133 A193129
KEYWORD
nonn,hard
AUTHOR
STATUS
approved