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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A253258 Square array read by antidiagonals, j>=1, k>=1: T(j,k) is the j-th number n such that the symmetric representation of sigma(n) has at least a part with maximum width k. 5
 1, 2, 6, 3, 12, 60, 4, 15, 72, 120, 5, 18, 84, 180, 360, 7, 20, 90, 240, 420, 840, 8, 24, 126, 252, 720, 1080, 3360, 9, 28, 140, 336, 1008, 1260, 3600, 2520, 10, 30, 144, 378, 1200, 1440, 3780, 5544, 5040, 11, 35, 168, 432, 1320, 1680, 3960, 6300, 7560, 10080, 13, 36, 198, 480, 1512, 1800, 4200, 6720, 9240, 12600, 15120 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS This is a permutation of the natural numbers. Row 1 gives A250070. For more information about the widths of the symmetric representation of sigma see A249351 and A250068. The next term: 120 < T(2,4) < 360. LINKS Table of n, a(n) for n=1..66. Index entries for sequences that are permutations of the natural numbers EXAMPLE The corner of the square array T(j,k) begins: 1, 6, 60, 120, 360, ... 2, 12, 72, ... 3, 15, 84, ... 4, 18, ... 5, 20, ... 7, ... ... For j = 1 and k = 2; T(1,2) is the first number n such that the symmetric representation of sigma(n) has a part with maximum width 2 as shown below: . . Dyck paths Cells Widths . _ _ _ _ _ _ _ _ . _ _ _ |_ |_|_|_|_|_ / / / / . | |_ |_|_|_ / / . |_ _ | |_|_|_| / / / . | | |_| / . | | |_| / . | | |_| / . The widths of the symmetric representation of sigma(6) = 12 are [1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1], also the 6th row of triangle A249351. CROSSREFS Cf. A000203, A196020, A235791, A236104, A237048, A237270, A237271, A237591, A237593, A245092, A249351, A250068, A250070, A250071. Sequence in context: A054619 A054618 A120859 * A098810 A360006 A081469 Adjacent sequences: A253255 A253256 A253257 * A253259 A253260 A253261 KEYWORD nonn,tabl AUTHOR Omar E. Pol, Jul 08 2015 EXTENSIONS More terms from Charlie Neder, Jan 11 2019 STATUS approved

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

Last modified September 19 09:30 EDT 2024. Contains 376007 sequences. (Running on oeis4.)