|
| |
|
|
A111333
|
|
Number of odd numbers <= n-th prime.
|
|
5
| |
|
|
1, 2, 3, 4, 6, 7, 9, 10, 12, 15, 16, 19, 21, 22, 24, 27, 30, 31, 34, 36, 37, 40, 42, 45, 49, 51, 52, 54, 55, 57, 64, 66, 69, 70, 75, 76, 79, 82, 84, 87, 90, 91, 96, 97, 99, 100, 106, 112, 114, 115, 117, 120, 121, 126, 129, 132, 135, 136, 139, 141, 142, 147, 154, 156, 157
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| This is A006254 (numbers n such that 2n-1 is prime) with a leading 1. - Lambert Klasen (lambert.klasen(AT)gmx.net), Nov 06 2005
|
|
|
LINKS
| Ray Chandler, Table of n, a(n) for n = 1..10000
|
|
|
FORMULA
| a(n)=ceiling((prime_n)/2). - Robert G. Wilson v (rgwv(at)rgwv.com), Nov 07 2005
|
|
|
MATHEMATICA
| Table[ Ceiling[ Prime[n]/2], {n, 65}] (* Robert G. Wilson v *)
|
|
|
CROSSREFS
| Cf. A006254.
Sequence in context: A171511 A205805 A006254 * A047701 A164528 A127963
Adjacent sequences: A111330 A111331 A111332 * A111334 A111335 A111336
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Nov 05 2005
|
|
|
EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Nov 07 2005
|
| |
|
|
