|
| |
|
|
A068697
|
|
Smallest prime which is a concatenation of n consecutive odd numbers. If no such prime exists then 0.
|
|
0
| |
|
|
3, 13, 0, 23252729, 2527293133, 0, 57911131517, 4547495153555759, 0, 135791113151719, 87899193959799101103105107, 0, 23252729313335373941434547, 357911131517192123252729, 0
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| a(3k) = 0.
|
|
|
EXAMPLE
| a(4) = 23252729 as a concatenation of 23,25,27 and 29. a(3) = 0 for a concatenation of 3 odd numbers is always a multiple of 3.
|
|
|
CROSSREFS
| Cf. A052077.
Sequence in context: A036300 A169815 A167368 * A010258 A107774 A122478
Adjacent sequences: A068694 A068695 A068696 * A068698 A068699 A068700
|
|
|
KEYWORD
| base,hard,nonn
|
|
|
AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 03 2002
|
|
|
EXTENSIONS
| More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 26 2002
|
| |
|
|
