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Search: id:A088730
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| A088730 |
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Numbers of the form p^p - 1 where p is a prime. |
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+0
6
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| 3, 26, 3124, 823542, 285311670610, 302875106592252, 827240261886336764176, 1978419655660313589123978, 20880467999847912034355032910566, 2567686153161211134561828214731016126483468
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Sum of reciprocals = 0.3721161884983118696170302604..
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FORMULA
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a(n)=A051674(n)-1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 15 2007
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PROGRAM
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(PARI) ptop(n, m) = { sr=0; forprime(x=2, n, y=x^x-m; print1(y", "); sr += 1.0/y; ); print(); print(sr) }
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CROSSREFS
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Cf. A088807, A125135 (factorizations).
Sequence in context: A129430 A005156 A101613 this_sequence A058956 A010257 A121068
Adjacent sequences: A088727 A088728 A088729 this_sequence A088731 A088732 A088733
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KEYWORD
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nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Nov 23 2003
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EXTENSIONS
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More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Feb 21 2004
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