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A105038
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Nonnegative n such that 6*n^2 + 6*n + 1 is a square.
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5
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0, 4, 44, 440, 4360, 43164, 427284, 4229680, 41869520, 414465524, 4102785724, 40613391720, 402031131480, 3979697923084, 39394948099364, 389969783070560, 3860302882606240, 38213059042991844, 378270287547312204
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| G.f.: 4*x/(1-11*x+11*x^2-x^3)
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PROG
| (PARI) for(n=0, 427284, if(issquare(6*n*(n+1)+1), print1(n, ", ")))
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CROSSREFS
| Cf. A001652, A001570, A049629, A105040, A104240, A077288, A105036, A103200, A105037.
Equals (A072256(n+1) - 1)/2.
Sequence in context: A198962 A002754 A187870 * A002278 A112897 A163013
Adjacent sequences: A105035 A105036 A105037 * A105039 A105040 A105041
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KEYWORD
| nonn
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AUTHOR
| Gerald McGarvey (Gerald.McGarvey(AT)comcast.net), Apr 03 2005
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 05 2005
Incorrect conjectures deleted by N. J. A. Sloane, Nov 24 2010
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