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A119156
Triangular numbers composed of digits {2,3,8}.
2
3, 28, 3828, 828828, 388333828828, 223832333328828, 332828222833288828828, 28388332838238232223328828
OFFSET
1,1
COMMENTS
a(9) > 10^45. - Tyler Busby, Mar 29 2023
FORMULA
a(n) = A000217(A119157(n)). - Tyler Busby, Mar 29 2023
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
Cf. A000217, A119157. See A119033 for a table of cross-references.
Sequence in context: A196735 A208438 A122891 * A175979 A096621 A362466
KEYWORD
nonn,base,more
AUTHOR
Giovanni Resta, May 10 2006
STATUS
approved