Search: id:a273960
|
| |
|
|
A273960
|
|
a(n) = (-1)^n*prime(n).
|
|
+0
0
|
|
|
|
-2, 3, -5, 7, -11, 13, -17, 19, -23, 29, -31, 37, -41, 43, -47, 53, -59, 61, -67, 71, -73, 79, -83, 89, -97, 101, -103, 107, -109, 113, -127, 131, -137, 139, -149, 151, -157, 163, -167, 173, -179, 181, -191, 193, -197, 199, -211, 223, -227, 229, -233, 239, -241, 251, -257, 263, -269, 271
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
|
|
|
FORMULA
|
|
|
|
EXAMPLE
|
a(1) = 2*(-1)^1 = -2.
a(2) = 3*(-1)^2 = 3.
a(3) = 5*(-1)^3 = -5.
|
|
|
MATHEMATICA
|
Table[Prime[n]*(-1)^n, {n, 1, 70}]
Table[If[OddQ[n], -Prime[n], Prime[n]], {n, 70}] (* Harvey P. Dale, Jul 01 2016 *)
|
|
|
PROG
|
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
sign
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
Search completed in 0.006 seconds
|
