A068621 - OEIS

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A068621

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

4

7, 78, 378, 1378, 91378, 7791378, 707914378, 3270729214378, 183270773294214378, 1783270773268946226147378

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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