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 A319865 Product of distinct prime factors of highly composite numbers (definition 1, A002182). 1
 1, 2, 2, 6, 6, 6, 6, 6, 30, 30, 30, 30, 30, 30, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 2310, 210, 210, 2310, 2310, 2310, 2310, 2310, 2310, 2310, 2310, 2310, 2310, 30030, 30030, 30030, 30030, 30030, 30030, 30030, 30030, 30030, 30030, 30030, 30030, 30030, 30030, 30030, 510510, 30030 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 Eric Weisstein's World of Mathematics, Highly Composite Number Wikipedia, Highly composite number FORMULA a(n) = A007947(A002182(n)). - Michel Marcus, Sep 30 2018 EXAMPLE n  | A002182(n)                       | a(n) ---+----------------------------------+-------------------------- 24 | 25200 = 2^4 * 3^2 * 5^2 * 7      |  210 = 2 * 3 * 5 * 7 25 | 27720 = 2^3 * 3^2 * 5   * 7 * 11 | 2310 = 2 * 3 * 5 * 7 * 11 26 | 45360 = 2^4 * 3^4 * 5   * 7      |  210 = 2 * 3 * 5 * 7 27 | 50400 = 2^5 * 3^2 * 5^2 * 7      |  210 = 2 * 3 * 5 * 7 CROSSREFS Cf. A002182, A007947, A108602, A112779, A272605. Sequence in context: A086447 A324032 A196872 * A350657 A140219 A259225 Adjacent sequences:  A319862 A319863 A319864 * A319866 A319867 A319868 KEYWORD nonn AUTHOR Seiichi Manyama, Sep 29 2018 STATUS approved

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Last modified August 9 21:08 EDT 2022. Contains 356026 sequences. (Running on oeis4.)