OFFSET
1,2
LINKS
Vladeta Jovovic and Donovan Johnson, Table of n, a(n) for n = 1..1000 (first 100 terms from Vladeta Jovovic)
EXAMPLE
a(3) = 4 because there are 3 even solutions (8, 10, 12) of phi(x) = 4 and for all k < 4 the number of even solutions of phi(x) = k is unequal to 3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Franz Vrabec, Jun 27 2007
STATUS
approved