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A080841 Number of sexy primes < 10^n. 1
0, 15, 74, 411, 2447, 16386, 117207, 879908, 6849047, 54818296, 448725003, 3741217498 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The corresponding numbers for twin primes and cousin primes are in A007508 and A080840, the greater of twin primes, cousin primes and sexy primes are in A006512, A046132 and A046117 respectively.

LINKS

Table of n, a(n) for n=1..12.

Eric Weisstein's World of Mathematics, Sexy Primes.

A. Granville, G. Martin, Prime number races, Amer. Math. Monthly vol 113, no 1 (2006) p 1.

PROG

(PARI) {c=0; p=7; for(n=1, 9, while(p<10^n, if(isprime(p-6), c++); p=nextprime(p+1)); print1(c, ", "))}

CROSSREFS

Cf. A023201, A046117.

Cf. A007508, A080840, A006512, A046132, A046117.

Sequence in context: A212092 A022817 A171341 * A022675 A214453 A317657

Adjacent sequences:  A080838 A080839 A080840 * A080842 A080843 A080844

KEYWORD

nonn

AUTHOR

Jason Earls, Mar 28 2003

EXTENSIONS

a(8) and a(9) from Klaus Brockhaus, Mar 30 2003

More terms from R. J. Mathar, Aug 05 2007

STATUS

approved

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Last modified September 23 16:41 EDT 2020. Contains 337315 sequences. (Running on oeis4.)