A163632 Triple and reverse digits.

1, 3, 9, 72, 612, 6381, 34191, 375201, 3065211, 3365919, 75779001, 300733722, 661102209, 7266033891, 37610189712, 631965038211, 3364115985981, 34975974329001, 300789229729401, 302881986763209, 726982069546809

Offset

1,2

Links

Vaclav Kotesovec, Table of n, a(n) for n = 1..1000

Vaclav Kotesovec, Plot of a(n)^(1/n) for n = 1..10000

Mathematica

a[n_] := a[n] = If[n==1, 1, IntegerReverse[3a[n-1]]];
Array[a, 40] (* Jean-François Alcover, Jan 01 2021 *)

Crossrefs

The following are parallel families: A000079 (2^n), A004094 (2^n reversed), A028909 (2^n sorted up), A028910 (2^n sorted down), A036447 (double and reverse), A057615 (double and sort up), A263451 (double and sort down); A000244 (3^n), A004167 (3^n reversed), A321540 (3^n sorted up), A321539 (3^n sorted down), A163632 (triple and reverse), A321542 (triple and sort up), A321541 (triple and sort down).

Cf. A132064, A045539, A132078, A132114, A132113, A133361.

Sequence in context: A018564 A004167 A321539 * A321541 A102322 A305855

Adjacent sequences: A163629 A163630 A163631 * A163633 A163634 A163635

Keyword

nonn,base

Author

Dmitry Kamenetsky, Aug 02 2009

Extensions

Offset changed from 0 to 1 by Vaclav Kotesovec, Jan 03 2020

Status

approved