A063794 Numbers k such that usigma(k) = k + phi(k).

2, 28, 1368, 1700, 342000, 2061000, 2120832, 65834560, 89082000

Offset: 1

Author

Jason Earls, Aug 18 2001

Keywords

• nonn
• more

Comments

No other terms < 2700000000. - Jud McCranie, Nov 04 2001

Crossrefs

Cf. A000010, A034448, A121048.

Programs

PARI

us(n) = sumdiv(n,d, if(gcd(d,n/d)==1,d));
for(n=1,10^8, if(us(n)==n+eulerphi(n),print1(n, ", ")))

Extensions

More terms from Jud McCranie, Nov 04 2001

Offset corrected by Mohammed Yaseen, Jul 17 2023