|
| |
|
|
A082702
|
|
Plateau and depression primes of the form 8*(10^a(n)-1)/9-7*(10^[ a(n)-1 ]+1) or (17*10^[ a(n)-1 ]-71)/9.
|
|
1
| |
|
|
3, 9, 15, 41, 93, 129, 885, 9425, 14769, 19259, 31235
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,1
|
|
|
COMMENTS
| Prime versus probable prime status and proofs are given in the author's table.
|
|
|
REFERENCES
| C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.
|
|
|
LINKS
| P. De Geest, PDP Reference Table
Makoto Kamada, Factorizations of 188...881.
|
|
|
EXAMPLE
| a(n)=15 -> 8*(10^15-1)/9-7*(10^14+1) = 188888888888881.
|
|
|
CROSSREFS
| Cf. A082697-A082720.
Essentially the same as A056249+2.
Sequence in context: A013581 A133997 A057909 * A065917 A053624 A119239
Adjacent sequences: A082699 A082700 A082701 * A082703 A082704 A082705
|
|
|
KEYWORD
| nonn,base
|
|
|
AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Apr 13 2003.
|
|
|
EXTENSIONS
| More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
|
| |
|
|
