A068138 Primes in the mirror concatenation of primes without reversal.

2, 131175323571113, 19171311753235711131719

Offset

0,1

Links

Table of n, a(n) for n=0..2.

Example

323 is not a prime hence not a member but concatenation of primes up to 13 about 2 i.e. 131175323571113 is a prime and a term.

Mathematica

Select[Table[FromDigits[Flatten[IntegerDigits/@Join[Prime[Range[n, 1, -1]], Prime[Range[2, n]]]]], {n, 8}], PrimeQ] (* Harvey P. Dale, Mar 14 2021 *)

Crossrefs

Sequence in context: A007352 A257229 A176944 * A309968 A082566 A273400

Adjacent sequences: A068135 A068136 A068137 * A068139 A068140 A068141

Keyword

base,hard,more,nonn,bref

Author

Amarnath Murthy, Feb 22 2002

Status

approved