A228533 Smallest primes of 2n or more digits such that the number formed from first n digits is same as the number formed from last n digits.

11, 11311, 1074107, 100111001, 10001610001, 1000017100001, 100000321000003, 10000001910000001, 1000000118100000011, 100000000381000000003, 10000000001710000000001, 1000000000016100000000001, 100000000000131000000000001, 10000000000003610000000000003

Offset

1,1

Links

Shyam Sunder Gupta, Table of n, a(n) for n = 1..100

Example

a(3) = 1074107 because the number formed from first 3 digits, that is, 107 is same as the number formed from last 3 digits and 1074107 is the smallest such prime.

Crossrefs

Sequence in context: A075854 A050786 A228566 * A088103 A180561 A185538

Adjacent sequences: A228530 A228531 A228532 * A228534 A228535 A228536

Keyword

nonn,base

Author

Shyam Sunder Gupta, Aug 24 2013

Status

approved