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A152452
Records in A152235.
2
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
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
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