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Table of n, a(n) for n=1..56.
Eric Weisstein's World of Mathematics, Perfect Number
Sequence in context: A044846 A037917 A204879 * A102883 A246946 A044891
Adjacent sequences: A097600 A097601 A097602 * A097604 A097605 A097606
Reinhard Zumkeller, Aug 30 2004