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 A051644 Primes of the form 6*p + 1 where p is also prime. 11
 13, 19, 31, 43, 67, 79, 103, 139, 223, 283, 367, 439, 499, 607, 619, 643, 787, 823, 907, 1039, 1087, 1399, 1447, 1543, 1579, 1627, 1663, 1699, 1759, 1867, 1879, 1987, 2083, 2203, 2239, 2383, 2659, 2767, 2803, 3019, 3343, 3463, 3559, 3607, 3643, 3847, 3919 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Analogous to A005385; can be called 6-safe primes. LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 FORMULA a(n) = 6*A007693(n) + 1. EXAMPLE 103 is in the sequence because both 17 and 6*17 + 1 = 103 are primes. MATHEMATICA Select[1 + 6Prime@Range[120], PrimeQ] (* Ray Chandler, Mar 14 2007 *) CROSSREFS Cf. A005384, A005385, A002476, A007693, A016921, A024899, A091178. Sequence in context: A069324 A040047 A163847 * A101408 A023252 A279426 Adjacent sequences: A051641 A051642 A051643 * A051645 A051646 A051647 KEYWORD nonn AUTHOR Labos Elemer EXTENSIONS Edited, corrected and extended by Ray Chandler, Mar 14 2007 STATUS approved

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Last modified September 15 11:45 EDT 2024. Contains 375938 sequences. (Running on oeis4.)