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A063794 usigma(n)=n+phi(n). 0
2, 28, 1368, 1700, 342000, 2061000, 2120832, 65834560, 89082000 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..10.

PROG

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

CROSSREFS

Cf. A034448.

Sequence in context: A143598 A324077 A071220 * A238817 A202942 A326366

Adjacent sequences:  A063791 A063792 A063793 * A063795 A063796 A063797

KEYWORD

nonn

AUTHOR

Jason Earls, Aug 18 2001

EXTENSIONS

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

STATUS

approved

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Last modified January 25 03:49 EST 2020. Contains 331241 sequences. (Running on oeis4.)