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A171232 Array read by antidiagonals, T(n,k) = 2*(n/k) - 1, if n mod k = 0; otherwise, T(n,k) = 1. 1
1, 3, 1, 5, 1, 1, 7, 1, 1, 1, 9, 3, 1, 1, 1, 11, 1, 1, 1, 1, 1, 13, 5, 1, 1, 1, 1, 1, 15, 1, 3, 1, 1, 1, 1, 1, 17, 7, 1, 1, 1, 1, 1, 1, 1, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 21, 9, 5, 3, 1, 1, 1, 1, 1, 1, 1, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 25, 11, 1, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
T(n,1): continued fraction expansion of coth(1).
T(n,2): continued fraction expansion of tan(1) = cot(pi/2 - 1).
LINKS
FORMULA
T(n,k) = A171233(n,k) - A077049(n,k).
EXAMPLE
Array begins
1 1 1 1 1 ...
3 1 1 1 1 ...
5 1 1 1 1 ...
7 3 1 1 1 ...
9 1 1 1 1 ...
.............
MATHEMATICA
T[n_, k_] := If[Divisible[n, k], 2*(n/k) - 1, 1]; Table[T[n-k+1, k], {n, 1, 10}, {k, 1, n}] //Flatten (* Amiram Eldar, Jun 29 2020 *)
CROSSREFS
Cf. T(n, 1) = A005408(n-1), T(n, 2) = A093178(n-1), A171233, A077049.
Sequence in context: A307410 A305444 A002945 * A093423 A326454 A227507
KEYWORD
cofr,nonn,tabl
AUTHOR
Ross La Haye, Dec 05 2009
EXTENSIONS
More terms from Amiram Eldar, Jun 29 2020
STATUS
approved

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Last modified February 21 22:50 EST 2024. Contains 370239 sequences. (Running on oeis4.)