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Search: id:A007506
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| A007506 |
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Primes p with property that p divides the sum of all primes <= p.
(Formerly M1554)
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+0
5
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OFFSET
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1,1
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 71, p. 25, Ellipses, Paris 2008.
Harry L. Nelson, Prime Sums, J. Rec. Math., 14 (1981), 205-206.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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C. Rivera, Puzzle
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EXAMPLE
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For example 2 divides 2, 5 divides 2+3, 71 divides 2+3+5+7+. . .+61+67, ...
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CROSSREFS
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Cf. A024011, A028581, A028582.
Sequence in context: A100009 A167218 A013045 this_sequence A042693 A128297 A102983
Adjacent sequences: A007503 A007504 A007505 this_sequence A007507 A007508 A007509
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KEYWORD
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nonn,nice,hard
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com)
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EXTENSIONS
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No others < 29505444491 - Jud McCranie (j.mccranie(AT)comcast.net), Jul 08 2000
No other terms < 10^12 [From Jon E. Schoenfield (jonscho(AT)hiwaay.net), Sep 11 2008]
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