OFFSET
1,1
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
EXAMPLE
Primes and composites among solutions:
k = 59, d(58) = 2, phi(59) = 58, phi(59+2) = phi(61) = 60 = phi(59) + d(59);
k = 56, d(56) = 8, phi(56) = 24, phi(56+8) = phi(64) = 32 = phi(56) + d(56).
PROG
(PARI) { n=0; for (x=1, 10^9, if (eulerphi(x + numdiv(x)) == (eulerphi(x) + numdiv(x)), write("b063693.txt", n++, " ", x); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 27 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Aug 23 2001
STATUS
approved