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

Author

Martin Renner, Dec 06 2011

Keywords

• nonn
• base

Examples

			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.
		

Links

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

Crossrefs

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

Programs

Sage

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

Extensions

More terms from Eric M. Schmidt, Feb 09 2014