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a(n) = A001221(2*n-1).
Table of n, a(n) for n=1..102.
Eric Weisstein's World of Mathematics, Odd Number
Eric Weisstein's World of Mathematics, Distinct Prime Factors
Sequence in context: A030382 A192004 A120889 * A120891 A034002 A176048
Adjacent sequences: A092520 A092521 A092522 * A092524 A092525 A092526
Reinhard Zumkeller, Apr 07 2004