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A144648 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 n. 1

%I #7 Jan 24 2019 03:56:45

%S 10147737600,166240237363200,310334052188160,9500311941120000

%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 n.

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

%e Factorization :

%e 2^12*5^2*7*13*3^2*11^2

%e 2^13*5^2*7*13*8191*3^2*11^2

%e 2^14*5*7^2*13*43*127*3^2*11^2

%e 2^15*5^4*7*13*31*151*3^2*11^2

%Y Cf. A047994, A144651.

%K nonn,more

%O 1,1

%A _Yasutoshi Kohmoto_, Jan 19 2009

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Last modified April 16 00:27 EDT 2024. Contains 371696 sequences. (Running on oeis4.)