|
Search: id:A082701
|
|
|
| A082701 |
|
Plateau and depression primes of the form 7*(10^a(n)-1)/9-6*(10^[ a(n)-1 ]+1) or (16*10^[ a(n)-1 ]-61)/9. |
|
+0
2
|
| |
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
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 177...771.
|
|
EXAMPLE
|
a(n)=7 -> 7*(10^7-1)/9-6*(10^6+1) = 1777771.
|
|
CROSSREFS
|
Cf. A082697 up to A082720.
Sequence in context: A161145 A008461 A043131 this_sequence A044145 A152777 A003530
Adjacent sequences: A082698 A082699 A082700 this_sequence A082702 A082703 A082704
|
|
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
|
|
|
Search completed in 0.002 seconds
|
