The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A152453 Where records in occur in A152235. 2
 1, 2, 4, 12, 48, 144, 576, 720, 2880, 25920, 129600, 414720, 907200, 14515200, 58060800, 130636800, 522547200, 3265920000, 13063680000, 22861440000, 91445760000, 251475840000, 1005903360000, 16094453760000, 64377815040000, 81478172160000, 1030045040640000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Amiram Eldar, Table of n, a(n) for n = 1..87 EXAMPLE First few terms of A152235 are 1, 2, 2, 3, 2, 2, 2, 2, 3, 2, 2, 6, so a(1) to a(4) are 1, 2, 4, 12. PROG (MAGMA) W:=[]; r:=0; for n in [1..1300000] do a:=&*PrimeDivisors(NumberOfDivisors(n)); if r lt a then r:=a; Append(~W, n); end if; end for; print W; CROSSREFS Cf. A152235 (largest squarefree number dividing the number of divisors of n), A152452 (records in A152235), A007947 (largest squarefree number dividing n). Subsequence of A025487. Sequence in context: A332235 A131387 A207647 * A277281 A172452 A004527 Adjacent sequences:  A152450 A152451 A152452 * A152454 A152455 A152456 KEYWORD nonn AUTHOR Klaus Brockhaus, Dec 04 2008 EXTENSIONS a(15)-a(20) from Donovan Johnson, Jul 30 2011 More terms from Amiram Eldar, Sep 01 2019 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 25 03:53 EDT 2021. Contains 346283 sequences. (Running on oeis4.)