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Note that all terms so far have only three prime factors.
Donovan Johnson, Table of n, a(n) for n = 1..1377 (terms < 10^18)
Eric Weisstein's World of Mathematics, Carmichael Number
Index entries for sequences related to Carmichael numbers
a(2) = 84350561 because 84350561 = 107*743*1061 and the smaller Carmichael numbers do not have the factors 107, 743 or 1061.
Cf. A002997, A087788.
Sequence in context: A258839 A213867 A139089 * A252352 A252345 A121508
Adjacent sequences: A202559 A202560 A202561 * A202563 A202564 A202565
Arkadiusz Wesolowski, Dec 21 2011