OFFSET
1,1
EXAMPLE
|phi(6)-phi(5)| = |2-4| = |d(6)-d(5)| = |4-2|
PROG
(PARI) ph1=1; d1=1; for(n=1, 40588485, ph2=eulerphi(n+1); d2=numdiv(n+1); if(abs(ph2-ph1)==abs(d2-d1), print1(n ", ")); ph1=ph2; d1=d2) /* Donovan Johnson, Oct 19 2012 */
CROSSREFS
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Dec 17 2001
EXTENSIONS
a(7)-a(33) from Donovan Johnson, Oct 19 2012
STATUS
approved