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 A121858 Smallest odd number having prime(n) divisors, where prime(n) is the n-th prime=A000040(n). 1
 3, 9, 81, 729, 59049, 531441, 43046721, 387420489, 31381059609, 22876792454961, 205891132094649, 150094635296999121, 12157665459056928801, 109418989131512359209, 8862938119652501095929, 6461081889226673298932241 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) is also the smallest number k with the property that the symmetric representation of sigma(k) has prime(n) subparts. - Omar E. Pol, Oct 08 2022 LINKS Table of n, a(n) for n=1..16. FORMULA a(n) = 3^(prime(n)-1) = 3^A006093(n). a(n) = A038547(A000040(n)). - Omar E. Pol, Oct 08 2022 MATHEMATICA 3^(Prime[Range[20]]-1) (* Harvey P. Dale, Mar 19 2013 *) CROSSREFS Cf. A006093, A061286. Cf. A000040, A038546, A237593, A279387. Sequence in context: A055156 A047912 A078684 * A215114 A032108 A216206 Adjacent sequences: A121855 A121856 A121857 * A121859 A121860 A121861 KEYWORD nonn AUTHOR Lekraj Beedassy, Aug 30 2006 STATUS approved

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Last modified February 20 21:52 EST 2024. Contains 370219 sequences. (Running on oeis4.)