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A068865 a(1) = 1; a(n) is the smallest triangular number not already in the sequence which differs from a(n-1) at every digit. 2
1, 3, 6, 10, 21, 15, 28, 36, 45, 66, 55, 78, 91, 105, 210, 136, 253, 120, 231, 153, 276, 190, 325, 171, 300, 435, 351, 406, 378, 465, 528, 496, 561, 630, 595, 666, 703, 820, 741, 903, 780, 861, 946, 1035, 990, 1081, 2145, 1326, 2080, 1128, 2016, 1225, 2346 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..53.

EXAMPLE

136 follows 210 as the smallest triangular number not included earlier and differing at every digit position with 210.

CROSSREFS

Cf. A000217, A068855.

Sequence in context: A306357 A122628 A343386 * A060179 A056411 A068855

Adjacent sequences:  A068862 A068863 A068864 * A068866 A068867 A068868

KEYWORD

nonn,base

AUTHOR

Amarnath Murthy, Mar 13 2002

EXTENSIONS

Corrected and extended by Sascha Kurz, Feb 02 2003

STATUS

approved

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Last modified January 26 11:55 EST 2022. Contains 350598 sequences. (Running on oeis4.)