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A104588 Product of primes less than or equal to sqrt(n). 2
1, 1, 1, 2, 2, 2, 2, 2, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210, 210 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..70.

FORMULA

a(n) = A034386(A000196(n)).

For n>0, #p(n) appears {(p(n+1))^2 - (p(n))^2} times [from n=(p(n))^2 to n=(p(n+1))^2 - 1, inclusive], i.e. A002110(n) appears A069482(n) times [from n=A001248(n) to n=A001248(n+1)-1, inclusive]

MAPLE

A104588 := proc(n)

        A034386(A000196(n)) ;

end proc:  # R. J. Mathar, Jul 28 2013

PROG

(PARI) a(n) = {pr = 1; forprime (p=2, sqrtint(n), pr *= p; ); return (pr); }  \\ Michel Marcus, Jul 28 2013

CROSSREFS

Sequence in context: A160762 A112968 A221838 * A157279 A214080 A010671

Adjacent sequences:  A104585 A104586 A104587 * A104589 A104590 A104591

KEYWORD

nonn

AUTHOR

Lekraj Beedassy, Mar 17 2005

STATUS

approved

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Last modified November 26 10:12 EST 2014. Contains 250038 sequences.