OFFSET
1,1
COMMENTS
As in A065557, all terms listed here are odd. Problem: Prove that this holds in general.
LINKS
Harry J. Smith and Jud McCranie, Table of n, a(n) for n = 1..289 (first 55 terms from Harry J. Smith)
EXAMPLE
Phi(195) = 96 = 192-96 = phi(193)-phi(194).
MATHEMATICA
Select[Range[3, 10^6], EulerPhi[ # ] == EulerPhi[ # - 2] - EulerPhi[ # - 1] &]
PROG
(PARI) { n=0; for (m=3, 10^9, if (eulerphi(m) == eulerphi(m - 2) - eulerphi(m - 1), write("b066232.txt", n++, " ", m); if (n==100, return)) ) } \\ Harry J. Smith, Feb 07 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Dec 18 2001
EXTENSIONS
a(13)-a(28) from Harry J. Smith, Feb 07 2010
STATUS
approved