A033852 Integers k such that j(k)*phi(k) = sigma(k), where j(n) = A033831(n).

35, 105, 248, 418, 594, 744, 812, 1254

Offset

1,1

Comments

a(9) > 10^7. - Michel Marcus, Nov 05 2014

a(9) > 10^8. - Manfred Scheucher, May 30 2015

Links

Table of n, a(n) for n=1..8.

Prog

(PARI) isok(n) = sumdiv(n, d, (d>=3) && (q=n/d) && (q>=1) && (q<=d-2))*eulerphi(n) == sigma(n); \\ Michel Marcus, Nov 05 2014

Crossrefs

Cf. A000010 (phi), A000203 (sigma), A033831.

Sequence in context: A015882 A347384 A010085 * A241610 A183854 A156332

Adjacent sequences: A033849 A033850 A033851 * A033853 A033854 A033855

Keyword

more,nonn

Author

Naohiro Nomoto

Status

approved