OFFSET
1,1
LINKS
Harry J. Smith, Table of n, a(n) for n =1..100
MATHEMATICA
cnkQ[n_]:=CompositeQ[n]&&EulerPhi[n+DivisorSigma[0, n]] == EulerPhi[ n]+ DivisorSigma[ 0, n]; Select[Range[240000], cnkQ]
PROG
(PARI) { n=0; for (x=1, 10^9, if (eulerphi(x + numdiv(x)) == (eulerphi(x) + numdiv(x)) && !isprime(x), write("b063702.txt", n++, " ", x); if (n==100, break)) ) } \\ Harry J. Smith, Aug 28 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Aug 23 2001
EXTENSIONS
More terms from Dean Hickerson, Aug 24 2001
STATUS
approved