The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A341706 Row 2 of semigroup multiplication table shown in A341317 and A341318. 3
 0, 2, 7, 8, 16, 17, 18, 29, 30, 31, 32, 46, 47, 48, 49, 50, 67, 68, 69, 70, 71, 72, 92, 93, 94, 95, 96, 97, 98, 121, 122, 123, 124, 125, 126, 127, 128, 154, 155, 156, 157, 158, 159, 160, 161, 162, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 232, 233, 234 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..10000 MAPLE t:= n-> n*(n-1)/2: f:= n-> ceil((sqrt(1+8*n)-1)/2): g:= n-> (x-> [x, n-t(x)][])(f(n)): a:= n-> (h-> t(h[1]*h[3])+h[2]*h[4])(map(g, [n, 2])): seq(a(n), n=0..60);  # Alois P. Heinz, Feb 17 2021 CROSSREFS Cf. A341317, A341318. Sequence in context: A080572 A263602 A162664 * A032689 A331489 A300476 Adjacent sequences:  A341703 A341704 A341705 * A341707 A341708 A341709 KEYWORD nonn AUTHOR N. J. A. Sloane, Feb 17 2021 EXTENSIONS More terms from Alois P. Heinz, Feb 17 2021 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 24 10:36 EDT 2021. Contains 345416 sequences. (Running on oeis4.)