|
|
A062220
|
|
Numbers k such that the smoothly undulating palindromic number (38*10^k - 83)/99 is a prime.
|
|
1
|
|
|
3, 9, 15, 17, 21, 57, 4233, 4335, 13221, 26447, 29897, 91997
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
Prime versus probable prime status and proofs are given in the author's table.
|
|
LINKS
|
|
|
EXAMPLE
|
k=21 -> (38*10^21 - 83)/99 = 383838383838383838383.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Patrick De Geest and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|