OFFSET
1,4
EXAMPLE
In decimal, the minima are about 1, 0.5, 0.333333, 0.266667, 0.228571, 0.207792, 0.196856, 0.195569, 0.191808, 0.185194, 0.183469, 0.181713, 0.180525, 0.173812, 0.172676, 0.171024, 0.165507, 0.165127, 0.163588.
MATHEMATICA
tMin = {{2, 1}}; Do[p = Prime[n]; tn = EulerPhi[p - 1]/(p - 1); If[tn < tMin[[-1, -1]], AppendTo[tMin, {p, tn}]], {n, 10^7}]; Numerator[Transpose[tMin][[2]]]
CROSSREFS
KEYWORD
nonn,frac,more
AUTHOR
T. D. Noe, Apr 17 2014
EXTENSIONS
a(20)-a(22) from Giovanni Resta, Apr 14 2016
STATUS
approved