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 A178083 Numbers k for which 10k+1, 10k+3, 10k+7, 10k+9, 10k+13 and 10k+19 are primes. 0
 1, 148, 16570, 32614, 66109, 102250, 106870, 124636, 146140, 191773, 305887, 415591, 421828, 552700, 834415, 1013440, 1176505, 1190050, 1306432, 1572082, 1576009, 1850437, 1873684, 1912954, 1921144, 2004997, 2103613, 2376340 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Subsequence of A178084 and of A007811. LINKS Table of n, a(n) for n=1..28. EXAMPLE Associated prime 6-plets are: 11, 13, 17, 19, 23, 29; # from k=1 1481, 1483, 1487, 1489, 1493, 1499; # from k=148 165701, 165703, 165707, 165709, 165713, 165719; # from k=16570 326141, 326143, 326147, 326149, 326153, 326159; # from k=32614 MATHEMATICA Flatten[Table[If[PrimeQ[10* n + 1] && PrimeQ[10*n + 3] && PrimeQ[10*n + 7] && PrimeQ[10*n + 9] && PrimeQ[10*(n + 1) + 3] && PrimeQ[10*(n + 1) + 9], n, {}], {n, 0, 200000}]] PROG (Magma) [n: n in [0..1000]| IsPrime(10*n+1) and IsPrime(10*n+3) and IsPrime(10*n+7) and IsPrime(10*n+9) and IsPrime(10*n+13) and IsPrime(10*n+19)] // Vincenzo Librandi, Nov 30 2010 CROSSREFS Cf. A007811. Sequence in context: A252770 A035822 A221349 * A128919 A223740 A223723 Adjacent sequences: A178080 A178081 A178082 * A178084 A178085 A178086 KEYWORD nonn AUTHOR Roger L. Bagula, May 19 2010 EXTENSIONS More terms from Zak Seidov, D. S. McNeil and Vincenzo Librandi, May 22 2010 STATUS approved

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Last modified June 24 23:28 EDT 2024. Contains 373691 sequences. (Running on oeis4.)