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Table of n, a(n) for n=1..40.
Eric Weisstein's World of Mathematics, Hundred-Dollar, Hundred-Digit Challenge Problems
Sequence in context: A198745 A200111 A201747 * A051559 A073239 A134882
Adjacent sequences: A117230 A117231 A117232 * A117234 A117235 A117236
Eric W. Weisstein, Mar 05, 2006