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 A201918 Automorphic numbers: n^2 ends with n in base 12 (written in base 10). 7
 0, 1, 4, 9, 64, 81, 513, 1216, 6400, 14337, 234496, 483328, 2502657, 17432577, 18399232, 412549120, 842530816, 4317249537, 11162091520, 50755272705, 692253097984, 2178269839360, 6737830608897, 46758772080640, 60234433298433, 474731593596928, 809186870951937 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Eric M. Schmidt, Table of n, a(n) for n = 1..1000 EXAMPLE a(3) = 4 = (4)_12 since 4^2 = 16 = (14)_12 ends with 4 in base 12. a(4) = 9 = (9)_12 since 9^2 = 81 = (69)_12 ends with 9 in base 12. a(5) = 64 = (54)_12 since 64^2 = 4096 = (2454)_12 ends with 54 in base 12. MATHEMATICA a201918[n_Integer] := Module[{i = 0}, Flatten[Last[Reap[      Do[If[        IntegerDigits[i^2, 12][[-Length[IntegerDigits[i, 12]] ;; -1]] ==          IntegerDigits[i, 12], Sow[i]], {i, n}]]]]]; a201918[12^6] (* Michael De Vlieger, Aug 13 2014 *) PROG (Sage) See A003226. - Eric M. Schmidt, Feb 09 2014 CROSSREFS Cf. A003226, A201821, A201919, A201921, A201948, A237583. Sequence in context: A069495 A029788 A062826 * A263675 A140483 A124683 Adjacent sequences:  A201915 A201916 A201917 * A201919 A201920 A201921 KEYWORD nonn,base AUTHOR Martin Renner, Dec 06 2011 EXTENSIONS More terms from Eric M. Schmidt, Feb 09 2014 STATUS approved

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Last modified August 17 11:14 EDT 2019. Contains 326057 sequences. (Running on oeis4.)