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Table of n, a(n) for n=1..53.
Eric Weisstein's World of Mathematics, Gelfand's Question
Sequence in context: A064832 A129638 A127624 * A146150 A244069 A058489
Adjacent sequences: A097613 A097614 A097615 * A097617 A097618 A097619
Eric W. Weisstein, Aug 16, 2004