A321539 3^n with digits rearranged into nonincreasing order.

1, 3, 9, 72, 81, 432, 972, 8721, 6651, 98631, 99540, 777411, 544311, 9543321, 9987642, 98744310, 76443210, 964321110, 988744320, 7666422111, 8876444310, 65433321000, 99865331100, 98877443211, 988654432221, 988876444320, 9888655432221

Offset

0,2

Links

Paolo Xausa, Table of n, a(n) for n = 0..1000

Formula

a(n) = A004186(A000244(n)). - Michel Marcus, Nov 10 2022

Mathematica

A321539[n_]:=FromDigits[ReverseSort[IntegerDigits[3^n]]]; Array[A321539, 40, 0] (* Paolo Xausa, Aug 10 2023 *)

Prog

(Python)
def A321539(n): return int(''.join(sorted(str(3**n), reverse=True))) # Chai Wah Wu, Nov 10 2022

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. A004186.

Sequence in context: A318030 A018564 A004167 * A163632 A321541 A102322

Adjacent sequences: A321536 A321537 A321538 * A321540 A321541 A321542

Keyword

nonn,base

Author

N. J. A. Sloane, Nov 19 2018

Status

approved