A203070 Smallest positive multiple of n that is palindromic in base 3, ignoring trailing zeros.

1, 2, 3, 4, 10, 6, 28, 8, 9, 10, 121, 12, 13, 28, 30, 16, 68, 18, 608, 20, 84, 242, 23, 24, 100, 26, 27, 28, 203, 30, 1550, 160, 363, 68, 280, 36, 1850, 608, 39, 40, 82, 84, 4988, 484, 90, 644, 1222, 48, 784, 100, 204, 52, 212, 54, 1210, 56, 1824, 1276, 1003

Offset: 1

Author

Harvey P. Dale, Dec 28 2011

Keywords

• nonn
• base

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A141709.

Programs

Mathematica

notpal3Q[i_]:=Module[{id=IntegerDigits[i,3]},While[Last[id]==0,id = Most[id]];id!=Reverse[id]]; lm3[n_]:=Module[{k=1},While[notpal3Q[k n],k++];k n]; Array[lm3,80]