login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A135667 Least k such that k!! > prime(1)*prime(2)*...*prime(n) where prime(n) is the n-th prime. 2
3, 4, 6, 8, 10, 12, 14, 16, 19, 21, 23, 25, 28, 30, 32, 34, 37, 39, 41, 43, 46, 48, 50, 52, 55, 57, 59, 62, 64, 66, 68, 71, 73, 75, 78, 80, 82, 84, 87, 89, 91, 94, 96, 98, 101, 103, 105, 108, 110, 112, 114, 117, 119, 121, 124, 126, 128, 131, 133, 135, 138 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..61.

PROG

(PARI) dbf(n) = prod(i = 0, floor((n-1)/2), n - 2*i );

a(n) = pr = prod(i = 1, n, prime(i)); k = 1; while(dbf(k) <= pr, k++); k; \\ Michel Marcus, Oct 13 2013

CROSSREFS

Cf. A006882, A073071.

Sequence in context: A092535 A215476 A204662 * A156624 A242932 A025201

Adjacent sequences:  A135664 A135665 A135666 * A135668 A135669 A135670

KEYWORD

nonn

AUTHOR

Zak Seidov, May 01 2008

EXTENSIONS

More terms from Michel Marcus, Oct 13 2013

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 16 01:43 EST 2019. Contains 330013 sequences. (Running on oeis4.)