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A066359
Nonsquarefree numbers n such that phi(n) = phi(n-2)-phi(n-1), where phi is Euler's totient function.
0
46795, 78183, 112995, 1986975, 2411175, 2689695, 2744145, 3619071, 3712545, 4738185, 8184715, 12176109, 13342959, 26400843, 33789015, 40425645, 61114185, 78464475, 83333565, 167077575, 212066541, 248682015, 326834725, 336828205, 353707705, 391078425, 880254585
OFFSET
1,1
COMMENTS
See comment in A066232.
Numbers in A066232 that are not squarefree.
PROG
(PARI) ph1=1; ph2=1; for(n=3, 880254585, ph3=eulerphi(n); if(issquarefree(n)==0, if(ph3==ph1-ph2, print1(n ", "))); ph1=ph2; ph2=ph3) /* Donovan Johnson, Oct 20 2012 */
CROSSREFS
Sequence in context: A205474 A232411 A171103 * A234774 A236053 A109030
KEYWORD
nonn
AUTHOR
Jason Earls, Dec 20 2001
EXTENSIONS
a(10)-a(27) from Donovan Johnson, Oct 20 2012
STATUS
approved