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%I #4 Apr 19 2016 01:07:33
%S 2,3,14,35,22,3,242,23,253,13,155,12,3,77,5,4,65,860,3,10882,14,91,13,
%T 5,80,543,946,25,1350,13
%N A unitary phi reciprocal amicable number: consider two different numbers a, b which satisfy the following equation for some integer k: uphi(a)=uphi(b)=1/k*a*b/(a-b); or equivalently, 1/uphi(a)=1/uphi(b)=k*(-1/a+1/b); sequence gives k numbers.
%C Here uphi(n)=A047994(n) is the unitary totient function: if n = Product p_i^e_i, uphi(n) = Product (p_i^e_i - 1).
%Y Cf. A047994, A080766, A080767, A067739, A067741.
%K nonn
%O 0,1
%A _Yasutoshi Kohmoto_
%E Kohmoto found 2nd, 6th, 13th, 25th terms. _Dean Hickerson_ calculated the other terms.
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