The On-Line Encyclopedia of Integer Sequences (OEIS)

A098355 revision #5

A098355

Multiplication table of the powers of three read by antidiagonals.

1, 3, 3, 9, 9, 9, 27, 27, 27, 27, 81, 81, 81, 81, 81, 243, 243, 243, 243, 243, 243, 729, 729, 729, 729, 729, 729, 729, 2187, 2187, 2187, 2187, 2187, 2187, 2187, 2187, 6561, 6561, 6561, 6561, 6561, 6561, 6561, 6561, 6561, 19683, 19683, 19683, 19683, 19683, 19683

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

3^A003056: 3^n appears n+1 times.

LINKS

Jeremy Gardiner, Table of n, a(n) for n = 0..349

EXAMPLE

1; 3,3; 9,9,9; 27,27,27,27;

MATHEMATICA

Flatten[Table[3^x, {x, 0, 13}, {y, 0, x}]] (* Alonso del Arte, Nov 29 2011 *)

CROSSREFS