|
| |
|
|
A087341
|
|
Smallest prime which is a concatenation of n successive composite numbers.
|
|
0
| |
|
|
89, 138140141, 87889091, 8890919293, 141516182021, 122123124125126128129, 121122123124125126128129, 707274757677788081, 21222425262728303233, 206207208209210212213214215216217, 405406407408410411412413414415416417
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 2,1
|
|
|
COMMENTS
| a(3) contains three digit composite numbers as every concatenation of two digit numbers n,n+2 and n+3 is == 0 (mod 7).
|
|
|
EXAMPLE
| a(2) = 89 is the concatenation of two successive composite numbers 8 and 9.
a(3) = 138140141 is the concatenation of 138,140 and 141.
|
|
|
CROSSREFS
| Sequence in context: A080051 A072314 A087538 * A093405 A058631 A078293
Adjacent sequences: A087338 A087339 A087340 * A087342 A087343 A087344
|
|
|
KEYWORD
| base,nonn
|
|
|
AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 06 2003
|
|
|
EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), May 10 2005
|
| |
|
|
