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A068622 a(1) = 5; a(n+1) = smallest triangular number > a(n) formed by adding at least one digit to a(n). 4
5, 15, 105, 1035, 103285, 10832185, 1083241785, 1087326541785, 108703236544918785, 108870232356544491187785 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
From a(3) onwards the sequence is A068618.
LINKS
CROSSREFS
Sequence in context: A358197 A121869 A118412 * A080449 A077702 A088418
KEYWORD
base,hard,more,nonn
AUTHOR
Amarnath Murthy, Feb 25 2002
EXTENSIONS
a(6)-a(9) from Max Alekseyev, Apr 21 2009
a(10) from Max Alekseyev, Jan 01 2014
STATUS
approved

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)