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A080483 Reverse concatenation of next n numbers with a(1) = 0. 4
0, 21, 543, 9876, 1413121110, 201918171615, 27262524232221, 3534333231302928, 444342414039383736, 54535251504948474645, 6564636261605958575655, 777675747372717069686766, 90898887868584838281807978 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(n) is a multiple of 3.
LINKS
MATHEMATICA
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 *)
CROSSREFS
Sequence in context: A209348 A095655 A221766 * A015255 A034789 A297635
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Mar 11 2003
EXTENSIONS
More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003
STATUS
approved

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Last modified July 21 17:44 EDT 2024. Contains 374475 sequences. (Running on oeis4.)