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Search: id:A134020
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| A134020 |
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Numbers n having exactly 4 divisors and such that n+1 is square. |
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+0
1
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| 8, 15, 35, 143, 323, 899, 1763, 3599, 5183, 10403, 11663, 19043, 22499, 32399, 36863, 39203, 51983, 57599, 72899, 79523, 97343, 121103, 176399, 186623, 213443, 272483, 324899, 359999, 381923, 412163, 435599, 656099, 675683, 685583, 736163
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A037074 is a subsequence. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 08 2008
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MAPLE
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with(numtheory): a:=proc(n) if type(sqrt(n+1), integer)=true and tau(n)=4 then n else end if end proc: seq(a(n), n=1..800000); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 27 2008
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CROSSREFS
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Sequence in context: A123526 A083686 A089954 this_sequence A132810 A137658 A118526
Adjacent sequences: A134017 A134018 A134019 this_sequence A134021 A134022 A134023
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KEYWORD
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nonn
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AUTHOR
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Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jan 11 2008
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EXTENSIONS
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Edited and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 27 2008
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