OFFSET
1,1
COMMENTS
For one such number, 41887255410, even 16n-1 and 16n+1 are primes.
EXAMPLE
253680 is there because 253679, 253681, 507359, 507361, 1014719, 1014721, 2029439 and 2029441 are all prime.
CROSSREFS
KEYWORD
nonn
AUTHOR
Don Reble, Apr 09 2002
STATUS
approved