

A068621


a(1) = 7; a(n+1) = smallest triangular number > a(n) formed by adding at least one digit to a(n).


4




OFFSET

1,1


LINKS

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


CROSSREFS

Cf. A068618, A068619, A068622, A068623, A068624.
Sequence in context: A107047 A210413 A045485 * A210406 A133272 A186657
Adjacent sequences: A068618 A068619 A068620 * A068622 A068623 A068624


KEYWORD

base,nonn


AUTHOR

Amarnath Murthy, Feb 25 2002


EXTENSIONS

a(5)a(7) from Ray G. Opao, Dec 14 2004
a(8)a(10) from Max Alekseyev, Apr 25 2009, Feb 11 2018


STATUS

approved



