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A125610
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Smallest prime p such that 5^n divides p^4 - 1.
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21
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2, 7, 193, 443, 14557, 14557, 735443, 3124999, 7812499, 78124999, 292968749, 853235443, 2441406251, 53834264557, 122070312499, 202513391693, 1118040735443, 3459595983307, 3459595983307, 270488404577057
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| W. Keller and J. Richstein Fermat quotients that are divisible by p.
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PROG
| (PARI) See A125609 - Martin Fuller (martin_n_fuller(AT)btinternet.com), Jan 11 2007
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CROSSREFS
| Cf. A125609 = Smallest prime p such that 3^n divides p^2 - 1. Cf. A125611 = Smallest prime p such that 7^n divides p^6 - 1. Cf. A125612 = Smallest prime p such that 11^n divides p^10 - 1. Cf. A125632 = Smallest prime p such that 13^n divides p^12 - 1. Cf. A125633 = Smallest prime p such that 17^n divides p^16 - 1. Cf. A125634 = Smallest prime p such that 19^n divides p^18 - 1. Cf. A125635 = Smallest prime p such that 257^n divides p^256 - 1.
Sequence in context: A173240 A042359 A015174 * A181864 A096463 A048560
Adjacent sequences: A125607 A125608 A125609 * A125611 A125612 A125613
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KEYWORD
| hard,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Nov 28 2006
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EXTENSIONS
| More terms from Ryan Propper (rpropper(AT)stanford.edu), Jan 02 2007
More terms from Martin Fuller (martin_n_fuller(AT)btinternet.com), Jan 11 2007
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