A334131 - OEIS

%I #11 Feb 16 2025 08:34:00

%S 0,1,11,111,1111,1221,11111,12221,111111,122221,123321,1111111,

%T 1222221,1233321,1356531,11111111,12222221,12333321,12344321,13566531,

%U 111111111,122222221,123333321,123444321,135666531,135787531,1111111111,1222222221

%N Numbers that can be written as a product of distinct repunits.

%H David A. Corneth, <a href="/A334131/b334131.txt">Table of n, a(n) for n = 1..10000</a>

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Repunit.html">Repunit</a>

%e 13566531 = 11*111*11111. - _David A. Corneth_, Mar 26 2021

%Y Cf. A000042, A002275, A015009, A077488, A083278, A308365.

%K nonn,base,changed

%O 1,3

%A _Ilya Gutkovskiy_, Apr 14 2020