A348247 -id:A348247 - cp's OEIS frontend

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

N. J. A. Sloane, Oct 23 2021

nonn

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!

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

Cf. A307720, A307730, A348247, A348449.

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cp's OEIS Frontend

A348448 Records in A307730.

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