login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A087315 a(n) = Product_{k=1..n} prime(k)^prime(n-k+1). 6
1, 4, 72, 21600, 190512000, 580909190400000, 428616352408083840000000, 859278392084450410309036800000000000, 2097197194438629126172451944256706311040000000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
EXAMPLE
a(3) = 2^5*3^3*5^2 = 21600.
MAPLE
seq(product(ithprime(k)^ithprime(n-k+1), k=1..n), n=0..10);
MATHEMATICA
Table[Product[Prime[k]^Prime[n - k + 1], {k, 1, n}], {n, 0, 10}] (* G. C. Greubel, Oct 14 2018 *)
PROG
(Sage) [prod(nth_prime(i)^nth_prime(k-i+1) for i in (1..k)) for k in (0..10)] # Giuseppe Coppoletta, Nov 03 2014
(PARI) for(n=0, 10, print1(prod(k=1, n, prime(k)^prime(n-k+1)), ", ")) \\ G. C. Greubel, Oct 14 2018
(Magma) [1] cat [(&*[NthPrime(k)^(NthPrime(n-k+1)): k in [1..n]]): n in [1..10]]; // G. C. Greubel, Oct 14 2018
CROSSREFS
Sequence in context: A152653 A344693 A172478 * A081460 A327040 A327112
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Sep 03 2003
EXTENSIONS
More terms from Jorge Coveiro, Dec 22 2004
Corrected by David Wasserman, May 02 2005
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 24 09:52 EDT 2024. Contains 373674 sequences. (Running on oeis4.)