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A120911 Triangle read by rows where t(n,m) is the (floor(n/m))th integer from among those positive integers not occurring earlier in the sequence. 3
1, 3, 2, 6, 4, 5, 10, 8, 7, 9, 15, 12, 11, 13, 14, 21, 18, 17, 16, 19, 20, 28, 24, 23, 22, 25, 26, 27, 36, 32, 30, 31, 29, 33, 34, 35, 45, 40, 39, 38, 37, 41, 42, 43, 44, 55, 50, 48, 47, 49, 46, 51, 52, 53, 54, 66, 60, 58, 57, 59, 56, 61, 62, 63, 64, 65, 78, 72, 70, 69, 68, 71 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..5050

FORMULA

T(n,k) = n(n-1)/2 + U(n,k), where U(n,1) = n, U(n,k) = k-1 if floor(n/k) = floor(n/(k-1)), otherwise U(n,k) = floor(n/k). - Franklin T. Adams-Watters, Jul 25 2006

MATHEMATICA

a = {1}; Do[r = Quotient[n, k]; AppendTo[a, Complement[Range[Max@a + r + 1], a][[r]]], {n, 2, 12}, {k, n}]; a (* Ivan Neretin, Dec 15 2016 *)

CROSSREFS

Cf. A120912, A120913.

Sequence in context: A195077 A191429 A191655 * A064789 A195111 A274315

Adjacent sequences:  A120908 A120909 A120910 * A120912 A120913 A120914

KEYWORD

easy,nonn,tabl

AUTHOR

Leroy Quet, Jul 15 2006

EXTENSIONS

More terms from Franklin T. Adams-Watters, Jul 25 2006

STATUS

approved

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Last modified October 26 00:31 EDT 2021. Contains 348256 sequences. (Running on oeis4.)