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Search: id:A069601
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| A069601 |
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Smallest triangular number containing all the digits of numbers from 1 to n. |
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+0
1
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| 1, 21, 231, 12403, 24531, 235641, 2467531, 13862745, 153694278, 10429651378, 1017139458621, 101114872391625, 10111496127133528, 1011137441915312286
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OFFSET
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1,2
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COMMENT
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For a(10) and higher, all duplicated digits must be in the term (for example a(10) has two 1's).
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EXAMPLE
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a(5) = 219453 = T(662) contains digits 1, 2, 3, 4 and 5.
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CROSSREFS
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Cf. A069599, A068600.
Sequence in context: A010973 A022586 A125409 this_sequence A089937 A023019 A036220
Adjacent sequences: A069598 A069599 A069600 this_sequence A069602 A069603 A069604
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KEYWORD
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base,more,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2002
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EXTENSIONS
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Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jan 24 2003
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