|
| |
|
|
A111309
|
|
Absolute difference between the sum of the odd digits and the sum of the even digits of the n-th prime.
|
|
1
| |
|
|
2, 3, 5, 7, 2, 4, 8, 10, 1, 7, 4, 10, 3, 1, 3, 8, 14, 5, 1, 8, 10, 16, 5, 1, 16, 2, 4, 8, 10, 5, 6, 5, 11, 13, 6, 7, 13, 2, 2, 11, 17, 6, 11, 13, 17, 19, 0, 1, 3, 5, 4, 10, 5, 4, 10, 5, 1, 6, 12, 9, 7, 10, 10, 5, 7, 11, 7, 13, 6, 8, 11, 17, 4, 13, 19, 2, 4, 19, 3, 5, 6, 5, 0, 2, 8, 5, 1, 8, 9, 7, 3
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
LINKS
| Ivars Peterson, Light Rings
|
|
|
EXAMPLE
| a(9)=1 because the 9th prime is 23 and the absolute difference between 2 & 3 is 1.
|
|
|
MATHEMATICA
| f[n_] := (id = IntegerDigits[ Prime[n]]; Abs[(Plus @@ id) - 2Plus @@ Select[id, OddQ]]); Table[f[n], {n, 91}]
|
|
|
CROSSREFS
| Cf. A071650.
Sequence in context: A074464 A074463 A038194 * A007605 A077765 A078400
Adjacent sequences: A111306 A111307 A111308 * A111310 A111311 A111312
|
|
|
KEYWORD
| nonn,base
|
|
|
AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com) and Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 02 2005
|
|
|
EXTENSIONS
| Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Aug 04 2010
|
| |
|
|
