OFFSET
1,1
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
EXAMPLE
15^2 + phi(15)^2 = 225 + 64 = 289 = 17^2, so 15 is a term of the sequence.
MATHEMATICA
Select[ Range[ 1, 10^4 ], IntegerQ[ Sqrt[ #^2 + EulerPhi[ # ]^2 ] ] & ]
PROG
(PARI) { n=0; for (m=1, 10^10, if (issquare(m^2 + eulerphi(m)^2), write("b066763.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Mar 23 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Jan 17 2002
STATUS
approved