|
|
A064820
|
|
a(n) = Product_{k=1..4*n-9} prime(k) - prime(4n)^4 where prime(i) = i-th prime.
|
|
1
|
|
|
-1874131, -7379971, 200535078449, 614889782525749169, 7858321551080266924799489, 267064515689275851355623723492869, 23984823528925228172706521638691738510609, 4014476939333036189094441199026045136644989502689, 1492182350939279320058875736615841068547583863325477042409
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
3,1
|
|
COMMENTS
|
It is known that a(n) > 0 for n >= 5.
|
|
LINKS
|
|
|
PROG
|
(PARI) { for (n=3, 50, p=prod(k=1, 4*n-9, prime(k)); write("b064820.txt", n, " ", p - prime(4*n)^4) ) } \\ Harry J. Smith, Sep 27 2009
|
|
CROSSREFS
|
|
|
KEYWORD
|
sign
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|