A055196 Primitive numbers k that divide sigma(k)*phi(k).

6, 28, 40, 117, 135, 496, 775, 891, 1701, 2176, 5632, 6875, 8128, 18688, 23552, 26624, 44375, 88723, 89667, 91136, 274625, 352256, 557375, 628849, 722701, 796797, 1071875, 1200663, 1288625, 1358127, 1512875, 2246503, 2473984, 2490368, 2896363, 2909375

Offset: 1

Author

Robert G. Wilson v, Jun 30 2000

Keywords

• easy
• nonn

Comments

Terms from A011775 that are not a multiple of a previous term. - Michel Marcus, Dec 21 2013

Links

• Michel Marcus, Table of n, a(n) for n = 1..68

Crossrefs

Cf. A011775.

Extensions

Extended using A011775 b-file by Michel Marcus, Dec 21 2013