OFFSET
1,1
EXAMPLE
2332 is derived by concatenating the first two primes (2 and 3) in the "forward" order and the last two digits are the same primes in the "reverse" order.
MATHEMATICA
Table[With[{cp=Flatten[IntegerDigits/@Prime[Range[n]]]}, FromDigits[Join[cp, Reverse[cp]]]], {n, 20}] (* Harvey P. Dale, Aug 18 2023 *)
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Parthasarathy Nambi, Sep 27 2004
EXTENSIONS
Corrected and extended by Harvey P. Dale, Aug 18 2023
STATUS
approved