OFFSET
1,3
COMMENTS
Starting at n=9, all known terms are of the form 3*2^k. - Ivan Neretin, May 01 2016
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..308
MATHEMATICA
EulerPhi@ NestList[Function[n, SelectFirst[Range[n + 1, 10^4], Divisible[EulerPhi@ #, EulerPhi@ n] &]], 1, 55] (* Michael De Vlieger, May 01 2016, Version 10 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Dec 10 2003
EXTENSIONS
More terms from David Wasserman, Jan 04 2006
Missing term a(1) prepended by Ivan Neretin, May 01 2016
STATUS
approved