Geodesic
Iterating the sum-of-divisors function.
Experimental mathematics, Tome 5 (1996) no. 2, pp. 91-100.

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Keywords: iteration of the sum-of-divisors function, -perfect numbers, computations, -perfect numbers 
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     title = {Iterating the sum-of-divisors function.},
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     zbl = {0866.11003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_1996__5_2_226924/}
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Cohen, Graeme L.; te Riele, Herman J.J. Iterating the sum-of-divisors function.. Experimental mathematics, Tome 5 (1996) no. 2, pp. 91-100. http://geodesic.mathdoc.fr/item/EXMA_1996__5_2_226924/