Geodesic
Unitary Perfect Numbers
Canadian mathematical bulletin, Tome 9 (1966) no. 2, pp. 147-153

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Let σ*(N) denote the sum of the unitary divisors of N, that is, It is easily seen that σ*(N) is multiplicative. In fact σ*(l) = 1 if N > 1 has the prime decomposition . Let us define a positive integer to be unitary perfect whenever σ*(N) = 2N. The first four such numbers are 6, 60, 90 and 87, 360. In a recent abstract [ l ] published by one of us, the last of these numbers was overlooked. No other unitary perfect numbers are known to the authors. 
Subbarao, M.V.; Warren, L. J. Unitary Perfect Numbers. Canadian mathematical bulletin, Tome 9 (1966) no. 2, pp. 147-153. doi: 10.4153/CMB-1966-018-4
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     title = {Unitary {Perfect} {Numbers}},
     journal = {Canadian mathematical bulletin},
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     year = {1966},
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     doi = {10.4153/CMB-1966-018-4},
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