OFFSET
1,1
COMMENTS
a(9) > 10^45. - Tyler Busby, Mar 29 2023
LINKS
Giovanni Resta, Tridigital Triangular Numbers.
FORMULA
PROG
(Python)
klimit = 10**6
A000217 = (k*(k+1)//2 for k in range(klimit)) # generator
print([m for m in A000217 if set(str(m)) <= set("238")]) # Michael S. Branicky, Mar 28 2021
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Giovanni Resta, May 10 2006
STATUS
approved