A228271 - OEIS

%I #8 Apr 03 2023 10:36:13

%S 473267,1919128,2131583,2390652,2844914,2982584,3909324,4280455,

%T 4658285,4728653,5165402,5254365,5369468,5458298,5551421,5647232,

%U 5817553,6070101,6334188,6495802,6877047,7027013,7074295,7087303,7157062,7369010,7392411,7946633,8469597

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

%H G. L. Honaker, Jr. and Chris Caldwell, <a href="https://t5k.org/curios/cpage/8999.html">Prime Curios! 473268</a>

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

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

%Y Cf. A181098, A190639.

%K nonn,base

%O 1,1

%A _Arkadiusz Wesolowski_, Aug 19 2013