A053921 - OEIS

%I #26 Jul 17 2025 16:25:45

%S 9,29929,332929,3323329,23299929,9222293933329,39333932392329,

%T 9222322299923929,32299993392299929223929,33932323229239993922329,

%U 29323939329333323299399329,3292922993992939999922923222293922929,223222929323939222223332232999233932329

%N Squares composed of digits {2,3,9}.

%H Patrick De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>.

%H Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm">Squares consisted of 3 different digits</a>.

%F a(n) = A053920(n)^2. - _Elmo R. Oliveira_, Jul 17 2025

%Y Cf. A053920.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Mar 15 2000

%E More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005

%E a(11) term from _Jon E. Schoenfield_, Sep 04 2006

%E a(12) term from Mishima's page added by _Max Alekseyev_, Mar 12 2009

%E a(13) from Mishima's website added by _Elmo R. Oliveira_, Jul 17 2025