|
|
A077795
|
|
Numbers k such that (10^k - 1)/9 + 8*10^floor(k/2) is a palindromic wing prime (a.k.a. near-repdigit palindromic prime).
|
|
2
|
|
|
|
OFFSET
|
1,1
|
|
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
|
|
|
FORMULA
|
|
|
EXAMPLE
|
9 is a term because (10^9 - 1)/9 + 8*10^4 = 111191111.
|
|
CROSSREFS
|
|
|
KEYWORD
|
more,nonn,base
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|