A068622 a(1) = 5; a(n+1) = smallest triangular number > a(n) formed by adding at least one digit to a(n).

5, 15, 105, 1035, 103285, 10832185, 1083241785, 1087326541785, 108703236544918785, 108870232356544491187785

Offset

1,1

Comments

From a(3) onwards the sequence is A068618.

Links

Table of n, a(n) for n=1..10.

Crossrefs

Cf. A068618, A068619, A068621, A068623, A068624.

Sequence in context: A358197 A121869 A118412 * A080449 A077702 A088418

Adjacent sequences: A068619 A068620 A068621 * A068623 A068624 A068625

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