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A136142
Four consecutive primes with two sets of twin primes.
0
5, 7, 11, 13, 11, 13, 17, 19, 101, 103, 107, 109, 137, 139, 149, 151, 179, 181, 191, 193, 191, 193, 197, 199, 419, 421, 431, 433, 809, 811, 821, 823, 821, 823, 827, 829, 1019, 1021, 1031, 1033, 1049, 1051, 1061, 1063, 1481, 1483, 1487, 1489, 1871, 1873
OFFSET
1,1
COMMENTS
Some of these are prime quadruples, but some are not. Call them unrestricted prime quadruples.
LINKS
Eric Weisstein's World of Mathematics, Prime Quadruplet
PROG
(PARI) {forprime(p1=0, 3000, p2=p1+2; if(!isprime(p2), next; ); forprime(p3=p2+1, 6000, p4=p3+2; if(isprime(p4), print1(p1, ", ", p2, ", ", p3, ", ", p4, ", ")); break; ))}
CROSSREFS
Cf. A007530.
Sequence in context: A122278 A124109 A095798 * A136162 A054500 A082684
KEYWORD
nonn
AUTHOR
Harry J. Smith, Dec 16 2007
STATUS
approved