|
|
A357253
|
|
a(n) is the largest prime < 6*n.
|
|
1
|
|
|
5, 11, 17, 23, 29, 31, 41, 47, 53, 59, 61, 71, 73, 83, 89, 89, 101, 107, 113, 113, 113, 131, 137, 139, 149, 151, 157, 167, 173, 179, 181, 191, 197, 199, 199, 211, 211, 227, 233, 239, 241, 251, 257, 263, 269, 271, 281, 283, 293, 293, 293, 311, 317, 317, 317, 331, 337, 347, 353
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
Largest prime that can be obtained after n rolls of a fair 6-sided die.
|
|
LINKS
|
|
|
FORMULA
|
|
|
EXAMPLE
|
a(11) = 61 as the largest prime <= 6*11 = 66 is 61; each of 62, 63, 64, 65 and 66 are not prime. - David A. Corneth, Sep 20 2022
|
|
MAPLE
|
a:= n-> prevprime(6*n):
|
|
MATHEMATICA
|
a[n_] := NextPrime[6*n, -1]; Array[a, 60] (* Amiram Eldar, Sep 20 2022 *)
|
|
PROG
|
(PARI) a(n) = precprime(6*n);
(Python)
from sympy import prevprime
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|