A104588 Product of primes less than or equal to sqrt(n).

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

Offset: 1

Author

Lekraj Beedassy, Mar 17 2005

Keywords

• nonn

Programs

Maple

A104588 := proc(n)
        A034386(A000196(n)) ;
end proc:  # R. J. Mathar, Jul 28 2013

PARI

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

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]