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A068855 a(1) = 1; a(n) is the smallest triangular number > a(n) which differs from it at every digit. 2
1, 3, 6, 10, 21, 36, 45, 66, 78, 91, 105, 210, 325, 406, 528, 630, 703, 820, 903, 1035, 2211, 3003, 4186, 5050, 6105, 7021, 8256, 9045, 10153, 21321, 30135, 41041, 50403, 61075, 70500, 82215, 90100, 101025, 210276, 303031, 411778, 500500, 611065 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..43.

EXAMPLE

325 belongs to this sequence and the next few triangular numbers are 351, 378, 406, 435; 406 is the smallest one which differs from 325 in all corresponding digit positions.

CROSSREFS

Cf. A068853, A068854, A068865.

Sequence in context: A068865 A060179 A056411 * A068882 A076713 A299017

Adjacent sequences:  A068852 A068853 A068854 * A068856 A068857 A068858

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Mar 12 2002

EXTENSIONS

Corrected and extended by Sascha Kurz, Feb 02 2003

STATUS

approved

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Last modified August 19 08:17 EDT 2019. Contains 326115 sequences. (Running on oeis4.)