A368496 Squarefree numbers k such that A368207(k^2) <> k+(sigma(k^2)-1)/2.

30, 35, 42, 70, 105, 110, 130, 143, 154, 165, 182, 195, 210, 221, 238, 255, 266, 285, 286, 323, 330, 357, 374, 385, 390, 391, 399, 418, 429, 437, 442, 455, 462, 483, 494, 506, 510, 546, 570, 595, 598, 609, 638, 646, 663, 665, 667, 682, 690, 713, 714, 715, 754

Offset: 1

Author

Chai Wah Wu, Dec 27 2023

Keywords

• nonn

Comments

Sequence suggested by the observation that A368207(k^2) = k+(sigma(k^2)-1)/2 for many numbers k.

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..1071

Crossrefs

Cf. A005117, A065764, A368207.