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A093441
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Beginning with 3, primes such that a(n) - 1 == 0 (mod a(n - 1) - 1) where a(n) - 1 is a squarefree number.
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1
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3, 7, 31, 211, 2311, 43891, 1272811, 16546531, 976245271, 36121074991, 1119753324691, 52628406260431, 3526103219448811, 186883470630786931, 7662222295862264131, 743235562698639620611, 54256196077000692304531
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Distinct from A073918.
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MATHEMATICA
| (* first do *) Needs["NumberTheory`NumberTheoryFunctions`"] (* then *) a[1] = 3; a[n_] := a[n] = Block[{k = m = a[n - 1] - 1}, k *= 2; While[ !PrimeQ[k + 1] || !SquareFreeQ[k], k += m]; k + 1]; Table[ a[n], {n, 17}] (from Robert G. Wilson v Apr 30 2004)
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CROSSREFS
| Cf. A073918, A093442.
Cf. A083772. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 05 2008]
Sequence in context: A002585 A103785 A083772 * A087864 A066676 A073917
Adjacent sequences: A093438 A093439 A093440 * A093442 A093443 A093444
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 01 2004
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EXTENSIONS
| a(7) onwards from Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 30 2004
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