The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A290042 a(n) = product of n consecutive primes starting with nextprime(a(n-1)), with a(0) = 1. 1
1, 2, 15, 7429, 3080515841187929, 277406882783236415738415740236053512093193768766780577802245485078023713619433 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
The prime factors are A290043.
LINKS
FORMULA
a(n) = Product_{k=n(n-1)/2 + 1..n(n+1)/2} A290043(k) for n > 0.
EXAMPLE
a(1) = nextprime(1) = 2;
a(2) = nextprime(2)*nextprime(nextprime(2)) = 3*5 = 15;
a(3) = nextprime(15)*nextprime(nextprime(15))*nextprime(nextprime(nextprime(15))) = 17*19*23 = 7429.
CROSSREFS
Cf. A290043.
Sequence in context: A064171 A365628 A135085 * A080911 A175981 A056072
KEYWORD
nonn
AUTHOR
Jonathan Sondow, Aug 20 2017
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 May 27 03:56 EDT 2024. Contains 372847 sequences. (Running on oeis4.)