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A208363
"3-ply" palindromic primes.
2
10000500001, 10000900001, 10001610001, 10002220001, 10002520001, 10003630001, 10006560001, 10008180001, 10009290001, 10013031001, 10013131001, 10014741001, 10016961001, 10021512001
OFFSET
1,1
COMMENTS
From the Ribenboim book: palindromic primes whose length is a palindromic prime whose length is a palindromic prime whose length is NOT a palindromic prime.
REFERENCES
Paulo Ribenboim, The New Book of Prime Number Records, Springer-Verlag New York Inc., 1996, pages 160-161.
LINKS
EXAMPLE
a(42042) = 99999199999, a(42043) = 10^100 + 3030*10^48 + 1. [Charles R Greathouse IV, Feb 26 2012]
CROSSREFS
Cf. A002385, A208362 (number of digits of these numbers).
Sequence in context: A017650 A244450 A293791 * A261458 A296158 A172688
KEYWORD
nonn,base
AUTHOR
Alvin Hoover Belt, Feb 25 2012
STATUS
approved