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A156674
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Numbers n such that n^2-2=0 mod 49.
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0
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10, 39, 59, 88, 108, 137, 157, 186, 206, 235, 255, 284, 304, 333, 353, 382, 402, 431, 451, 480, 500, 529, 549, 578, 598, 627, 647, 676, 696, 725, 745, 774, 794, 823, 843, 872, 892, 921, 941, 970, 990, 1019, 1039, 1068, 1088, 1117, 1137, 1166, 1186, 1215
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| G.f.: (10*x^2 + 29*x + 10)/(x^3 - x^2 - x + 1) [From Alexander R. Povolotsky (pevnev(AT)juno.com), Feb 15 2009]
a(n)=a(n-1)+a(n-2)-a(n-3) = 49n/2-49/4+9*(-1)^n/4. G.f.: x(2x+5)(5x+2)/((1+x)(1-x)^2). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 19 2009]
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EXAMPLE
| 10^2-2=0 mod (49); 39^2-2=0 mod (49); 59^2-2=0 mod (49); 88^2-2=0 mod (49).
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CROSSREFS
| Sequence in context: A064603 A164298 A050479 * A022277 A188480 A059722
Adjacent sequences: A156671 A156672 A156673 * A156675 A156676 A156677
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KEYWORD
| nonn
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Feb 13 2009
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Feb 14 2009
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