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 A138657 Primes p such that 48*p - 1 and 48*p + 1 are twin primes. 3
 5, 31, 89, 109, 271, 331, 571, 599, 661, 709, 719, 761, 859, 1109, 1171, 1319, 1489, 1619, 1699, 1811, 2399, 2971, 3041, 3119, 3329, 3449, 3659, 4211, 4421, 4861, 5051, 5309, 5441, 6011, 6379, 6491, 6571, 6661, 7039 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 EXAMPLE 5 is a term since it is a prime and 48*5 - 1 = 239 and 48*5 + 1 = 241 are twin primes. 31 is a term since it is a prime and 48*31 - 1 = 1487 and 48*31 + 1 = 1489 are twin primes. MATHEMATICA a=48; Select[Prime[Range[10^3]], PrimeQ[a*#-1]&&PrimeQ[a*#+1]&] CROSSREFS Cf. A001097, A001359, A006512. Cf. A138656, A138658, A138659. Sequence in context: A299505 A102732 A213068 * A106909 A304659 A115519 Adjacent sequences: A138654 A138655 A138656 * A138658 A138659 A138660 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, May 15 2008 STATUS approved

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Last modified May 21 04:06 EDT 2024. Contains 372720 sequences. (Running on oeis4.)