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A086122
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Primes of the form (5^k-1)/4.
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6
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31, 19531, 12207031, 305175781, 177635683940025046467781066894531, 14693679385278593849609206715278070972733319459651094018859396328480215743184089660644531, 35032461608120426773093239582247903282006548546912894293926707097244777067146515037165954709053039550781
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Corresponding exponents k are listed in A004061. - Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 23 2007
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FORMULA
| a(n) = (5^A004061(n) - 1)/4 = A003463[ A004061(n) ]. - Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 23 2007
A003464 INTERSECT A000040.
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MATHEMATICA
| Do[f=(5^n-1)/4; If[PrimeQ[f], Print[{n, f}]], {n, 1, 1000}] - Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 23 2007
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CROSSREFS
| Cf. A000668, A076481.
Cf. A003463, A004061, A074479.
Sequence in context: A073099 A074218 A161395 * A176349 A033176 A188956
Adjacent sequences: A086119 A086120 A086121 * A086123 A086124 A086125
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jul 23 2003
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EXTENSIONS
| More terms from Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 23 2007
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