The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A345018 For each n, append to the sequence n^2 consecutive integers, starting from n. 1
 1, 2, 3, 4, 5, 3, 4, 5, 6, 7, 8, 9, 10, 11, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Irregular triangle read by rows T(n,k) in which row n lists the integers from n to n + n^2 - 1, with n >= 1. LINKS Paolo Xausa, Table of n, a(n) for n = 1..10416 (rows 1..31 of the triangle, flattened) FORMULA T(n,k) = n + k - 1, with n >= 1 and 1 <= k <= n^2. EXAMPLE Written as an irregular triangle T(n,k) the sequence begins: n\k| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ... ---+--------------------------------------------------------------- 1 | 1; 2 | 2, 3, 4, 5; 3 | 3, 4, 5, 6, 7, 8, 9, 10, 11; 4 | 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19; ... MATHEMATICA Table[Range[n, n^2+n-1], {n, 6}] (* Paolo Xausa, Sep 05 2023 *) PROG (PARI) row(n) = vector(n^2, k, n+k-1); \\ Michel Marcus, Jun 08 2021 CROSSREFS Column 1: A000027. Right border: A028387. Row lengths: A000290. Row sums: A255499. Cf. A064866, A074279. Sequence in context: A279850 A117607 A215092 * A309079 A194551 A212644 Adjacent sequences: A345015 A345016 A345017 * A345019 A345020 A345021 KEYWORD nonn,tabf AUTHOR Paolo Xausa, Jun 05 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 2 09:28 EST 2024. Contains 370461 sequences. (Running on oeis4.)