A348448 Records in A307730.

1, 2, 3, 6, 9, 12, 15, 21, 24, 27, 36, 45, 49, 56, 63, 72, 81, 90, 99, 110, 121, 132, 143, 150, 165, 176, 187, 190, 209, 220, 231, 243, 253, 264, 275, 290, 319, 324, 351, 360, 375, 377, 406, 435, 459, 475, 476, 493, 522, 551, 567, 575, 588, 609, 638, 667, 675, 700, 725, 754, 783, 810, 837, 858

Offset

1,2

Comments

The points with coordinates (x,y) = (A348449(n), A348448(n)), n = 1,2,3,... are the upper envelope of the graph of A307730. Based on the first 10^6 terms of A307730 we get 110 points on the upper envelope, which appear to lie very roughly on the curve y = x^0.57. It would be nice to have a more trustworthy expression for this curve!

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000 (first 110 terms from N. J. A. Sloane)

Rémy Sigrist, Scatterplot of the first 10000000 terms of A307730

Rémy Sigrist, C program for A348448

N. J. A. Sloane, Table of n, A307730(n) for n = 1..999999

Prog

(C) See Links section.

Crossrefs

Cf. A307720, A307730, A348247, A348449.

Sequence in context: A308012 A077121 A302488 * A140495 A174873 A213172

Adjacent sequences: A348445 A348446 A348447 * A348449 A348450 A348451

Keyword

nonn

Author

N. J. A. Sloane, Oct 23 2021

Status

approved