A069176 Numbers n such that n-1, n+1, 2n-1, 2n+1, 4n-1, 4n+1, 8n-1 and 8n+1 are all prime.

253680, 1138830, 58680930, 90895770, 124253010, 269877300, 392071680, 613813200, 1014342210, 1277981670, 1413015030, 1453978680, 1753585680, 2919331380, 3424037190, 3538972710, 4025789040, 4175762010, 4362439200

Offset

1,1

Comments

For one such number, 41887255410, even 16n-1 and 16n+1 are primes.

Links

Table of n, a(n) for n=1..19.

Example

253680 is there because 253679, 253681, 507359, 507361, 1014719, 1014721, 2029439 and 2029441 are all prime.

Crossrefs

Cf. A118860. Subset of A069175.

Sequence in context: A236163 A140967 A236443 * A253725 A140079 A321505

Adjacent sequences: A069173 A069174 A069175 * A069177 A069178 A069179

Keyword

nonn

Author

Don Reble, Apr 09 2002

Status

approved