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A064109
Product_{k=1..n} prime(k) - prime(4n).
1
-5, -13, -7, 157, 2239, 29941, 510403, 9699559, 223092719, 6469693057, 200560489937, 7420738134587, 304250263526971, 13082761331669767, 614889782588491129, 32589158477190044419, 1922760350154212638733, 117288381359406970982911
OFFSET
1,1
COMMENTS
It is known that a(n) > 0 for n >= 4.
REFERENCES
D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, Section VII.18, p. 493.
LINKS
S. E. Mamangakis, Synthetic proof of some prime number inequalities, Duke Math. J., 29 (1962), 471-473.
PROG
(PARI) a(n) = prod(k=1, n, prime(k)) - prime(4*n); \\ Michel Marcus, Jun 19 2018
CROSSREFS
Sequence in context: A088315 A138296 A094474 * A175484 A210694 A298316
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Oct 16 2001
STATUS
approved