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A113541
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Numbers n such that 18n^2+1 is multiple of 19.
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1
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1, 18, 20, 37, 39, 56, 58, 75, 77, 94, 96, 113, 115, 132, 134, 151, 153, 170, 172, 189, 191, 208, 210, 227, 229, 246, 248, 265, 267, 284, 286, 303, 305, 322, 324, 341, 343, 360, 362, 379, 381, 398, 400, 417, 419, 436, 438, 455, 457, 474, 476, 493, 495, 512
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(1)=1, a(2)=18 then add alternatively 2 and 17
a(n)=19*(n-1)-a(n-1), (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2010]
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MATHEMATICA
| s={}; Do[If[IntegerQ[(18n^2+1)/19], AppendTo[s, n]], {n, 200}]; s
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CROSSREFS
| Sequence in context: A164711 A036170 A064271 * A181453 A113542 A075865
Adjacent sequences: A113538 A113539 A113540 * A113542 A113543 A113544
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KEYWORD
| nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Jan 13 2006
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EXTENSIONS
| More terms (a(22)-a(56) from Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 23 2009
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