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 A103912 Numbers k such that 2*prime(k)+1, 2*prime(k+1)+1, 2*prime(k+2)+3 and 2*prime(k+3)-3 are also consecutive primes. 2
 20382, 409331, 588060, 718919, 892113, 1583347, 1680668, 2909044, 4104093, 4335628, 4589071, 4910417, 5167262, 5227231, 5276556, 5667695, 6228570, 7874791, 8307560, 8923874, 9004943, 9098100, 9616214, 9792649, 10374603, 12293364, 12884611, 13450210, 13798661, 13877345 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..30. MATHEMATICA s={}; n=1; p1=2; p2=3; p3=5; Do[p4 = NextPrime[p3]; If[PrimeQ[2*p1+1] && (np = NextPrime[2*p1+1]) == 2*p2+1 && (np2 = NextPrime[np]) == 2*p3+3 && NextPrime[np2] == 2*p4-3, AppendTo[s, n]]; p1=p2; p2=p3; p3=p4; n++, {10^5}]; s (* Amiram Eldar, Jul 23 2021 *) CROSSREFS Cf. A103911, A103913. Sequence in context: A156408 A045815 A182294 * A256104 A269279 A234552 Adjacent sequences: A103909 A103910 A103911 * A103913 A103914 A103915 KEYWORD nonn AUTHOR Pierre CAMI, Feb 21 2005 EXTENSIONS More terms from Amiram Eldar, Jul 23 2021 STATUS approved

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Last modified June 1 13:57 EDT 2023. Contains 363069 sequences. (Running on oeis4.)