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 A245568 Initial members of prime quadruples (n, n+2, n+24, n+26). 1
 5, 17, 617, 857, 1277, 1427, 1697, 2087, 2687, 3557, 4217, 5417, 5477, 7307, 8837, 9437, 10067, 13877, 17657, 18287, 20747, 21587, 23537, 25577, 27917, 28547, 30467, 32117, 32297, 35507, 37337, 37547, 40127, 41177, 41387, 41957 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This sequence is prime n, where there exist two twin prime pairs of (n, n+2, n+24, n+26). Excluding 5, this is a subsequence of each of the following: A128468 (a(n) = 30*n + 17), A039949 (Primes of the form 30n-13), A181605 (twin primes ending in 7). A253624 is a subsequence of this sequence. LINKS Karl V. Keller, Jr., Table of n, a(n) for n = 1..100000 Eric Weisstein's World of Mathematics, Prime Quadruplet. Eric Weisstein's World of Mathematics, Twin Primes Wikipedia, Twin prime EXAMPLE For n = 17, the numbers 17, 19, 41, 43 are primes. MATHEMATICA a245568[n_] := Select[Prime@ Range@ n, And[PrimeQ[# + 2], PrimeQ[# + 24], PrimeQ[# + 26]] &]; a245568[5000] (* Michael De Vlieger, Jan 11 2015 *) PROG (Python) from sympy import isprime for n in range(1, 10000001, 2): ..if isprime(n) and isprime(n+2) and isprime(n+24) and isprime(n+26): print(n, end=', ') CROSSREFS Cf. A077800 (twin primes), A128468, A039949, A181605, A253624. Sequence in context: A096996 A256236 A070294 * A218378 A119531 A248921 Adjacent sequences: A245565 A245566 A245567 * A245569 A245570 A245571 KEYWORD nonn AUTHOR Karl V. Keller, Jr., Jan 09 2015 STATUS approved

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Last modified April 20 11:59 EDT 2024. Contains 371838 sequences. (Running on oeis4.)