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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Some of these are prime quadruples, but some are not. Call them unrestricted prime quadruples. LINKS Table of n, a(n) for n=1..50. 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 Adjacent sequences: A136139 A136140 A136141 * A136143 A136144 A136145 KEYWORD nonn AUTHOR Harry J. Smith, Dec 16 2007 STATUS approved

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Last modified September 16 22:04 EDT 2024. Contains 375979 sequences. (Running on oeis4.)