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A069601 Smallest triangular number containing all the digits of numbers from 1 to n. 0
1, 21, 231, 12403, 24531, 235641, 2467531, 13862745, 153694278, 10429651378, 1017139458621, 101114872391625, 10111496127133528, 1011137441915312286 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For a(10) and higher, all duplicated digits must be in the term (for example a(10) has two 1's).

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

a(5) = 219453 = T(662) contains digits 1, 2, 3, 4 and 5.

CROSSREFS

Cf. A088628, A068600.

Sequence in context: A022586 A125409 A161581 * A173347 A089937 A175843

Adjacent sequences:  A069598 A069599 A069600 * A069602 A069603 A069604

KEYWORD

base,more,nonn

AUTHOR

Amarnath Murthy, Mar 25 2002

EXTENSIONS

Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jan 24 2003

STATUS

approved

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Last modified February 23 02:43 EST 2018. Contains 299473 sequences. (Running on oeis4.)