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Search: id:A062317
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| A062317 |
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Numbers n such that 5n-1 is a perfect square. |
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+0
1
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| 1, 2, 10, 13, 29, 34, 58, 65, 97, 106, 146, 157, 205, 218, 274, 289, 353, 370, 442, 461, 541, 562, 650, 673, 769, 794, 898, 925, 1037, 1066, 1186, 1217, 1345, 1378, 1514, 1549, 1693, 1730, 1882, 1921, 2081, 2122, 2290, 2333, 2509, 2554, 2738, 2785, 2977
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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FORMULA
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a(n)=((2+5n)^2+1)/5 if n is odd; a(n)=((3+5n)^2+1)/5 if n is even
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PROGRAM
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(PARI) je=[]; for(n=1, 5000, if(issquare(5*n-1), je=concat(je, n))); je
(PARI) { n=0; for (m=1, 10^9, if (issquare(5*m - 1), write("b062317.txt", n++, " ", m); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 04 2009]
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CROSSREFS
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Cf. A036666.
Sequence in context: A045218 A058216 A037386 this_sequence A140510 A098735 A050546
Adjacent sequences: A062314 A062315 A062316 this_sequence A062318 A062319 A062320
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KEYWORD
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nonn
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AUTHOR
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Santi Spadaro (spados(AT)katamail.com), Jul 12 2001
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EXTENSIONS
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More terms from Jason Earls (zevi_35711(AT)yahoo.com), Jul 14 2001
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