OFFSET
1,1
COMMENTS
a(11) <= 524476614025. - Donovan Johnson, Feb 04 2011
No other terms < 9.585 x 10^12 [ Jud McCranie, Sep 03 2013]
EXAMPLE
phi(7) = phi(9) = 6 and phi(8) = phi(10) = 4, so 7 is in the sequence.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jud McCranie, Jan 01 2000
EXTENSIONS
a(6)-a(10) from Donovan Johnson, Feb 04 2011
a(11)-a(15) from Jud McCranie, Jan 02 2013
a(16)-a(20) from Jud McCranie, Aug-Sep 2013
STATUS
approved