60372

Appears in sequences

• A unitary phi reciprocal amicable number: consider two different numbers r, s which satisfy the following equation for some integer k: uphi(r) = uphi(s) = (1/k) * r * s / (r-s); or equivalently, 1/uphi(r) = 1/uphi(s) = k * (1/s - 1/r); sequence gives s numbers.at n=17A080767
• Number of nondecreasing arrangements of n nonzero numbers in -n..n with sum zero.at n=8A188326
• T(n,k)=Number of nondecreasing arrangements of n nonzero numbers in -(n+k-2)..(n+k-2) with sum zero.at n=53A188333
• Ordered product of the terms in a primitive Pythagorean quadruple (with repetitions).at n=37A367737