A144651 - OEIS

%I #5 Jan 24 2019 03:56:55

%S 8954982400,146700521676800,273857689763840,8383654522880000

%N Consider pairs of numbers m,n such that UnitaryPhi(m)=UnitaryPhi(n)= (3*m^(1/2)-2*n^(1/2))^2, m<n. Sequence gives m.

%C If m=n then only one example m=n=1 exists.

%e Factorization :

%e 2^12*5^2*7*13*31^2

%e 2^13*5^2*7*13*8191*31^2

%e 2^14*5*7^2*13*43*127*31^2

%e 2^15*5^4*7*13*31*151*31^2

%Y Cf. A047994, A144648.

%K nonn,more

%O 1,1

%A _Yasutoshi Kohmoto_, Jan 19 2009