A152452 Records in A152235.

1, 2, 3, 6, 10, 15, 21, 30, 42, 70, 105, 110, 210, 330, 390, 462, 546, 770, 910, 1155, 1365, 2310, 2730, 3570, 3990, 4290, 4830, 5610, 6006, 6270, 6630, 7854, 10010, 15015, 30030, 39270, 43890, 46410, 51870, 53130, 62790, 67830, 72930, 81510, 82110, 84630, 102102

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, 3, 6.

Prog

(Magma) R:=[]; r:=0; for n in [1..1300000] do a:=&*PrimeDivisors(NumberOfDivisors(n)); if r lt a then r:=a; Append(~R, a); end if; end for; print R;

Crossrefs

Cf. A152235 (largest squarefree number dividing the number of divisors of n), A152453 (where records occur in A152235), A007947 (largest squarefree number dividing n).

Sequence in context: A254033 A356314 A102366 * A217741 A074134 A056178

Adjacent sequences: A152449 A152450 A152451 * A152453 A152454 A152455

Keyword

nonn

Author

Klaus Brockhaus, Dec 04 2008

Extensions

a(15)-a(18) from Sean A. Irvine, Mar 09 2011

a(19)-a(20) from Donovan Johnson, Jul 30 2011

More terms from Amiram Eldar, Sep 01 2019

Status

approved