|
|
A031368
|
|
Odd-indexed primes: a(n) = prime(2n-1).
|
|
54
|
|
|
2, 5, 11, 17, 23, 31, 41, 47, 59, 67, 73, 83, 97, 103, 109, 127, 137, 149, 157, 167, 179, 191, 197, 211, 227, 233, 241, 257, 269, 277, 283, 307, 313, 331, 347, 353, 367, 379, 389, 401, 419, 431, 439, 449, 461, 467, 487, 499, 509, 523, 547, 563
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
Appeared as a puzzle in "Stickelers", a nationally distributed feature, by Terry Stickels, Sep 28 2006. - Franklin T. Adams-Watters, Sep 28 2006
Also every second prime starting with 2. - Cino Hilliard, Dec 02 2007
|
|
LINKS
|
|
|
FORMULA
|
|
|
MAPLE
|
|
|
MATHEMATICA
|
|
|
PROG
|
(Haskell)
a031368 = a000040 . ((subtract 1) . (* 2))
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|