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 A079823 Consider the triangle shown below; sequence contains the concatenation of numbers read at a 45-degree angle upwards with horizontal beginning with the first term of a row. 2
 1, 2, 43, 75, 1186, 16129, 22171310, 29231814, 3730241915, 4638312520, 564739322621, 675748403327, 79685849413428, 92806959504235, 10693817060514336, 121107948271615244, 137122108958372625345, 1541381231099684736354, 1721551391241109785746455 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 ... a(n) also is the concatenation of the terms of the n-th row of A056536. - Michel Marcus, Dec 14 2023 LINKS G. C. Greubel, Table of n, a(n) for n = 1..395 MAPLE read("transforms"): A079823aux := proc(n, k) A000124(n)+k ; end proc: A079823 := proc(n) local L, k, n0 ; n0 := n-1 ; L := [] ; for k from 0 do if k > n0-k then break; end if; L := [op(L), A079823aux(n0-k, k)] ; end do: digcatL(L) ; end proc: # R. J. Mathar, Aug 23 2012 # second Maple program: T:= (i, j)-> i*(i-1)/2+j: a:= n-> parse(cat(seq(T(n-j, j+1), j=0..(n-1)/2))): seq(a(n), n=1..23); # Alois P. Heinz, Aug 03 2022 MATHEMATICA Table[FromDigits[Join@@IntegerDigits[Table[Binomial[n-k+1, 2] + k, {k, Ceiling[n/2]}]]], {n, 30}] (* G. C. Greubel, Dec 13 2023 *) CROSSREFS Cf. A056536, A079824. Sequence in context: A137415 A090194 A107200 * A107156 A062582 A073594 Adjacent sequences: A079820 A079821 A079822 * A079824 A079825 A079826 KEYWORD base,nonn AUTHOR Amarnath Murthy, Feb 11 2003 EXTENSIONS More terms from Jason D. W. Taff (jtaff(AT)jburroughs.org), Oct 31 2003 Corrected by Philippe Deléham, Feb 16 2004 STATUS approved

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Last modified February 22 06:21 EST 2024. Contains 370240 sequences. (Running on oeis4.)