OFFSET
1,2
COMMENTS
The values of unitary totient function of numbers such that k and k+1 have the same value.
The unitary version of A003275.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..2198
MATHEMATICA
uphi[n_] := If[n==1, 1, (Times @@ (Table[#[[1]]^#[[2]] - 1, {1}] & /@ FactorInteger[n]))[[1]]]; a={}; u1=0; For[k=0, k<10^5, k++; u2=uphi[k]; If[u1==u2, a = AppendTo[a, u1]]; u1=u2]; a
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Jul 26 2017
STATUS
approved