

A091294


Numbers n such that phi(n) = phi(3n+1).


1



75973, 301513, 2053393, 3404053, 4022573, 5399123, 6461473, 8395613, 9848813, 11804173, 14124133, 15680573, 17173333, 20705533, 23609083, 28988353, 30290563, 32845633, 35025943, 36791813, 39630803, 42598663, 43605943, 44116333, 53795083, 54396533, 54563693
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

Is it accidental that most terms have form 10k+3?


LINKS



MATHEMATICA

Do[If[Equal[EulerPhi[n], EulerPhi[3*n+1]], Print[n]], {n, 1, 100000000}]


PROG



CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



