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A099105 If n = Product p_i^r_i let Uphi(n) = Product(p_i^r_i - 1). Call (x,y) a square unitary phi amicable pair if Uphi(x)^2 = Uphi(y)^2 = x^2-y^2. Sequence gives x values for square unitary phi amicable pairs. 1

%I

%S 204,2856,16536

%N If n = Product p_i^r_i let Uphi(n) = Product(p_i^r_i - 1). Call (x,y) a square unitary phi amicable pair if Uphi(x)^2 = Uphi(y)^2 = x^2-y^2. Sequence gives x values for square unitary phi amicable pairs.

%C There may be no further terms.

%e Factorizations : 2^2*3*17, 2^3*7*3*17, 2^3*13*3*53

%Y See A099106 for y values.

%K nonn,bref,more

%O 1,1

%A _Yasutoshi Kohmoto_

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Last modified April 21 22:12 EDT 2019. Contains 322328 sequences. (Running on oeis4.)