OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
Select[Range[10^5], IntegerQ[Sqrt[ # + 1]] && IntegerQ[Sqrt[EulerPhi[ # ] + 1]] &]
CROSSREFS
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Jan 17 2004
STATUS
approved