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A057185
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Numbers n such that (19^n + 1)/20 is a prime.
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1
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OFFSET
| 1,1
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LINKS
| J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
H. Dubner and T. Granlund, Primes of the Form (b^n+1)/(b+1), J. Integer Sequences, 3 (2000), #P00.2.7.
H. Lifchitz, Mersenne and Fermat primes field
Paul Bourdelais,A Generalized Repunit Conjecture [From Paul Bourdelais (pbourdelais(AT)radiantblue.com), Mar 18 2010]
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PROG
| (Other) PFGW v3.3.1 [From Paul Bourdelais (pbourdelais(AT)radiantblue.com), Mar 18 2010]
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CROSSREFS
| Sequence in context: A060429 A052292 A154301 * A157467 A093343 A153685
Adjacent sequences: A057182 A057183 A057184 * A057186 A057187 A057188
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Sep 15 2000
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EXTENSIONS
| 26183 from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
a(8)=30713 & a(9)=41201 are probable primes discovered by Paul Bourdelais (pbourdelais(AT)radiantblue.com), Mar 15 2010
a(10)=77951 is a probable prime discovered by Paul Bourdelais (pbourdelais(AT)radiantblue.com), Mar 18 2010
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