A119152 - OEIS

%I #15 May 03 2023 09:14:38

%S 3,55,253,325,5253,255255,2235555,2355535,3252525,222552253,

%T 225323523253,33533553332223253,523355323323222253,

%U 252235353552533225335,22323332525535322225335,223533355523232355353232325353525335

%N Triangular numbers composed of digits {2,3,5}.

%C a(17) > 10^40. - _Tyler Busby_, Mar 28 2023

%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr235.html">Tridigital Triangular Numbers</a>.

%F a(n) = A000217(A119153(n)). - _Tyler Busby_, Mar 28 2023

%Y Cf. A000217, A053919, A119153. See A119033 for a table of cross-references.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, May 10 2006

%E a(16) from _Tyler Busby_, Mar 28 2023