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 A070450 a(n) = n^2 mod 28. 7
 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 FORMULA a(n) = a(n-28). - G. C. Greubel, Mar 24 2016 MATHEMATICA Table[Mod[n^2, 28], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 27 2011 *) PROG (PARI) a(n)=n^2%28 \\ Charles R Greathouse IV, Apr 06 2016 CROSSREFS Cf. A070448, A070449. Sequence in context: A070452 A070653 A070451 * A070449 A070448 A081403 Adjacent sequences:  A070447 A070448 A070449 * A070451 A070452 A070453 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, May 12 2002 STATUS approved

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