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A112559
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Numbers k such that both k and 4k + 1 are in A005098.
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2
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3, 9, 18, 24, 48, 69, 93, 102, 108, 144, 168, 177, 213, 249, 258, 273, 282, 324, 357, 363, 387, 399, 438, 444, 504, 507, 573, 609, 669, 678, 738, 759, 762, 777, 807, 864, 867, 909, 942, 948, 963, 1014, 1068, 1074, 1182, 1197, 1248, 1299, 1389, 1392, 1413, 1488
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OFFSET
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1,1
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COMMENTS
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All terms are multiples of 3.
Numbers k such that 4*k+1 and 16*k+5 are both prime. - Vincenzo Librandi, Dec 13 2010
These k cannot have least significant digits 0, 1, 5, or 6. - J. M. Bergot, Jul 06 2011
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LINKS
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R. J. Mathar, Table of n, a(n) for n = 1..1738
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FORMULA
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a(n) = 3 * A179652(n). - Joerg Arndt, Jul 10 2011
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PROG
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(Magma) [n: n in [0..3000] | IsPrime(4*n+1)and IsPrime(16*n+5)] // Vincenzo Librandi, Dec 13 2010
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CROSSREFS
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Cf. A002144, A175600.
Sequence in context: A360365 A310332 A210991 * A030784 A203594 A325751
Adjacent sequences: A112556 A112557 A112558 * A112560 A112561 A112562
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov, May 26 2007
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STATUS
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approved
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