OFFSET
1,2
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A015126(n^2).
n^2/log log n << a(n) <= n^2. More specifically (on the lower bound), a(n) > n^2(e^-gamma + o(1))/log log n. - Charles R Greathouse IV, Aug 14 2017
MATHEMATICA
With[{s = EulerPhi /@ Range[10^4]}, Table[First@ FirstPosition[s, n EulerPhi@ n], {n, 58}]] (* Michael De Vlieger, Aug 14 2017 *)
PROG
(PARI) a(n) = my(k=1); while(1, if(eulerphi(k)==n*eulerphi(n), return(k)); k++) \\ Felix Fröhlich, Aug 14 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Altug Alkan, Aug 13 2017
STATUS
approved