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A036843 Floor(X/Y), where X = concatenation of the triangular numbers and Y = concatenation of natural numbers. 0
1, 1, 1, 11, 110, 1102, 11024, 110242, 1102422, 1102422, 1102422, 1102422, 1102422, 11024223, 110242233, 1102422331, 11024223315, 110242233152, 1102422331526, 11024223315266, 110242233152667, 1102422331526679 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

a(n) -> 11024223315266792255432504568329867353511401594905438085....

LINKS

Table of n, a(n) for n=1..22.

MATHEMATICA

f[n_] := (k = 1; x = y = "0"; While[k < n + 1, x = StringJoin[x, ToString[k(k+1)/2]]; y = StringJoin[y, ToString[k]]; k++ ]; Return[ Floor[ ToExpression[x] / ToExpression[y]]] ); Table[ f[n], {n, 1, 25} ]

Module[{nn=30, trs, nts}, trs=IntegerDigits/@Accumulate[Range[nn]]; nts= IntegerDigits/@ Range[nn]; Table[Floor[ FromDigits[Flatten[ Take[trs, n]]]/ FromDigits[ Flatten[ Take[nts, n]]]], {n, nn}]] (* Harvey P. Dale, Jul 15 2017 *)

CROSSREFS

Cf. A007908.

Sequence in context: A109217 A266680 A320890 * A299301 A278786 A279826

Adjacent sequences:  A036840 A036841 A036842 * A036844 A036845 A036846

KEYWORD

nonn,base,less

AUTHOR

Robert G. Wilson v, Jan 09 2002

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 28 2010

STATUS

approved

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Last modified August 11 18:37 EDT 2020. Contains 336428 sequences. (Running on oeis4.)