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A080483
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Reverse concatenation of next n numbers with a(1) = 0.
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4
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0, 21, 543, 9876, 1413121110, 201918171615, 27262524232221, 3534333231302928, 444342414039383736, 54535251504948474645, 6564636261605958575655, 777675747372717069686766, 90898887868584838281807978
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OFFSET
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1,2
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COMMENTS
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a(n) is a multiple of 3.
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LINKS
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MATHEMATICA
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With[{nn=20}, FromDigits[Flatten[IntegerDigits[#]]]&/@(Reverse/@ TakeList[ Range[0, (nn(nn+1))/2], Range[nn]])] (* Requires Mathematica version 11 or later *) (* Harvey P. Dale, Jun 10 2019 *)
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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EXTENSIONS
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More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003
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STATUS
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approved
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