A201948 Automorphic numbers: n^2 ends with n in base 18 (written in base 10).

0, 1, 9, 10, 81, 244, 729, 5104, 6561, 98416, 413344, 1476225, 9034497, 24977728, 263063296, 349156737, 2711943424, 8308017153, 96467701761, 101891588608, 1286623443969, 2283843782656, 30847581595648, 33420828483585, 352189631991808, 804641749434369

Offset

1,3

Links

Eric M. Schmidt, Table of n, a(n) for n = 1..1000

Example

a(3) = 9 = (9)_18 since 9^2 = 81 = (49)_18 ends with 9 in base 18.
a(4) = 10 = (A)_18 since 10^2 = 100 = (5A)_18 ends with A in base 18.
a(5) = 81 = (49)_18 since 81^2 = 6561 = (1249)_18 ends with 49 in base 18.

Prog

(Sage) # See A003226. - Eric M. Schmidt, Feb 09 2014

Crossrefs

Cf. A003226, A201821, A201918, A201919, A201921, A237583.

Sequence in context: A025635 A116555 A038300 * A249311 A041039 A041176

Adjacent sequences: A201945 A201946 A201947 * A201949 A201950 A201951

Keyword

nonn,base

Author

Martin Renner, Dec 06 2011

Extensions

More terms from Eric M. Schmidt, Feb 09 2014

Status

approved