OFFSET
1,3
REFERENCES
D. M. Burton, Elementary Number Theory, Allyn and Bacon Inc., Boston MA, 1976, p. 141.
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
PROG
(PARI) je=[]; for(n=1, 1000, if(issquare(eulerphi(n)), je=concat(je, eulerphi(n)))); je
(PARI) n=0; for (m=1, 10^5, if (issquare(a=eulerphi(m)), write("b062732.txt", n++, " ", a); if (n==1000, break))) \\ Harry J. Smith, Aug 10 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 12 2001
STATUS
approved