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A117834
Triangular numbers with consecutive digits.
0
0, 1, 3, 6, 10, 21, 45, 78, 210
OFFSET
1,3
COMMENTS
Digits can be in ascending or descending order. After 9 comes 0.
Next term, if there is one, has more than 300 digits. - Joshua Zucker, May 11 2006
Terms correspond to (some) integral points on a finite number of Mordell curves. Thus there is only a finite number of terms. It is likely that no other terms besides those listed exist. - Max Alekseyev, Oct 08 2023
CROSSREFS
Cf. A000217.
Sequence in context: A068149 A068709 A068804 * A317857 A346733 A220827
KEYWORD
base,fini,more,nonn
AUTHOR
Luc Stevens (lms022(AT)yahoo.com), Apr 30 2006
STATUS
approved