A228271 Prime-free centuries such that the next century is also prime-free.

473267, 1919128, 2131583, 2390652, 2844914, 2982584, 3909324, 4280455, 4658285, 4728653, 5165402, 5254365, 5369468, 5458298, 5551421, 5647232, 5817553, 6070101, 6334188, 6495802, 6877047, 7027013, 7074295, 7087303, 7157062, 7369010, 7392411, 7946633, 8469597

Offset

1,1

Links

Table of n, a(n) for n=1..29.

G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 473268

Example

473267 is in the sequence because there is no prime between 47326699 and 47326900.

Prog

(PARI) d=100; for(n=1, 10^7, if(nextprime(d*n)>d*(n+2), print1(n, ", ")));

Crossrefs

Cf. A181098, A190639.

Sequence in context: A114673 A251370 A190639 * A219996 A183659 A213994

Adjacent sequences: A228268 A228269 A228270 * A228272 A228273 A228274

Keyword

nonn,base

Author

Arkadiusz Wesolowski, Aug 19 2013

Status

approved