A208363 "3-ply" palindromic primes.

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

Alvin Hoover Belt, Table of n, a(n) for n = 1..100

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

Adjacent sequences: A208360 A208361 A208362 * A208364 A208365 A208366

Keyword

nonn,base

Author

Alvin Hoover Belt, Feb 25 2012

Status

approved