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A145843
Primes q which are not of the form 6*p*(6*p+x)-1 or 6*p*(6*p+x)+1 with p = prime and -6*p < x < 6*p
1
2, 3, 5, 7, 383, 647, 769, 863, 971, 1151, 1153, 1297, 1459, 1801, 2161, 2251, 2399, 2591, 2593, 2699, 2879, 2917, 2999, 3001, 3457, 3527, 3529, 3779, 3889, 4049, 4051, 4201, 4373, 4409, 4703, 4799, 4801, 4861, 5039, 5399, 5669, 5879, 5881, 6047, 6143
OFFSET
1,1
COMMENTS
for n < 100000 more than 90% of the primes are of the form 6*p*(6*p+x) +1 or -1 with -6*p < x < 6*p, what for n > 100000 ?
LINKS
EXAMPLE
2,3,5,7 are < 6*2, so the sequence starts 2,3,5,7 6*2*(6*2-11)-1=11 prime so 11 not in the sequence 6*2*(6*2-11)+1=13 prime so 13 not in the sequence ................ 383+1=384, 384/12 = 32, 383=6*2(6*2+20)-1, 20 > 6*2 so 383 = q(5)
CROSSREFS
Sequence in context: A083183 A046477 A360789 * A090720 A114780 A241681
KEYWORD
nonn
AUTHOR
Pierre CAMI, Oct 21 2008
STATUS
approved