A080484 -id:A080484 - cp's OEIS frontend

A080481 Concatenation of next n numbers (a(1) = 0).

0, 12, 345, 6789, 1011121314, 151617181920, 21222324252627, 2829303132333435, 363738394041424344, 45464748495051525354, 5556575859606162636465, 666768697071727374757677, 78798081828384858687888990

Offset: 1

Amarnath Murthy, Mar 11 2003

a(n) is a multiple of 3.

Cf. A080482, A080483, A080484.

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003

A080483 Reverse concatenation of next n numbers with a(1) = 0.

Original entry on oeis.org

0, 21, 543, 9876, 1413121110, 201918171615, 27262524232221, 3534333231302928, 444342414039383736, 54535251504948474645, 6564636261605958575655, 777675747372717069686766, 90898887868584838281807978

Offset: 1

Amarnath Murthy, Mar 11 2003

a(n) is a multiple of 3.

Harvey P. Dale, Table of n, a(n) for n = 1..200

Cf. A080481, A080482, A080484.

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 *)

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003

A080482 a(n) = A080481(n)/3.

Original entry on oeis.org

0, 4, 115, 2263, 337040438, 50539060640, 7074108084209, 943101044111145, 121246131347141448, 15154916165017175118, 1852191953202054212155, 222256232357242458252559, 26266027276128286229296330

Offset: 1

Amarnath Murthy, Mar 11 2003

Cf. A080481, A080483, A080484.

Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003

cp's OEIS Frontend

A080481 Concatenation of next n numbers (a(1) = 0).

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A080483 Reverse concatenation of next n numbers with a(1) = 0.

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Author

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Mathematica

Extensions

A080482 a(n) = A080481(n)/3.

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