OFFSET
1,1
COMMENTS
There are 12815608 possible prime patterns for centuries having 15 primes. - Tim Johannes Ohrtmann, Aug 27 2015
LINKS
Brian Kehrig, Table of n, a(n) for n = 1..1000 (terms 1..200 from T. D. Noe)
EXAMPLE
8 is in this sequence because there are 15 primes between 800 and 899 (809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883 and 887).
PROG
(PARI) for(n=1, 1e6, if(sum(k=100*n, 100*(n+1), ispseudoprime(k))==15, print1(n", "))); \\ Charles R Greathouse IV, Feb 21 2011
(PARI) N=100; s=0; forprime(p=2, 4e9, if(p>N, if(s==15, print1((N\100)-1, ", ")); s=1; N=100*(p\100+1), s++)) \\ Charles R Greathouse IV, Feb 21 2011
CROSSREFS
KEYWORD
nonn
AUTHOR
Tim Johannes Ohrtmann, Feb 20 2011
EXTENSIONS
a(19)-a(42) from Charles R Greathouse IV, Feb 21 2011
STATUS
approved