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A090658
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Numbers n such that n-1 is a prime of the form 4k+3.
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1
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4, 8, 12, 20, 24, 32, 44, 48, 60, 68, 72, 80, 84, 104, 108, 128, 132, 140, 152, 164, 168, 180, 192, 200, 212, 224, 228, 240, 252, 264, 272, 284, 308, 312, 332, 348, 360, 368, 380, 384, 420, 432, 440, 444, 464, 468, 480, 488, 492, 500, 504, 524, 548, 564, 572
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988
Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..5000
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FORMULA
| a(n) = A087915(n)+A089257(n), A089193(n)+A089257(n)-5.
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MATHEMATICA
| okQ[n_]:=Module[{x=n-1}, PrimeQ[x]&&IntegerQ[(x-3)/4]]; Select[Range[1, 1000, 1], okQ] (* Vincenzo Librandi, Dec 13 2011 *)
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CROSSREFS
| Cf. A002145, A087915, A089193, A089257.
Sequence in context: A133466 A037168 A033691 * A122108 A123723 A190891
Adjacent sequences: A090655 A090656 A090657 * A090659 A090660 A090661
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KEYWORD
| easy,nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 14 2003
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EXTENSIONS
| Corrected and extended by T. D. Noe (noe(AT)sspectra.com), Oct 25 2006
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