A380921 Least k such that A380783(k) = n.

1, 2, 6, 15, 28, 40, 66, 91, 120, 144, 170, 204, 252, 299, 330, 374, 414, 475, 522, 570, 616, 667, 720, 798, 840, 910, 986, 1050, 1116, 1189, 1274, 1333, 1395, 1480, 1554, 1628, 1692, 1776, 1850, 1924, 2016, 2107, 2178, 2244, 2356, 2432, 2511, 2624, 2697, 2808

Offset: 1

Author

Pontus von Brömssen, Feb 08 2025

Keywords

• nonn

Crossrefs

Cf. A380783.

Formula

A380783(a(n)) = n.