OFFSET
1,1
LINKS
M. Fleuren, Factors and primes of Smarandache sequences.
M. Fleuren, Smarandache Factors and Reverse factors
Carlos Rivera, Puzzle 8. Primes by Listing, The Prime Puzzles & Problems connection.
MATHEMATICA
Select[Range[2, 12], PrimeOmega[FromDigits[Flatten[IntegerDigits[Range[#, 1, -1]]]]]==2 &] (* Jayanta Basu, May 30 2013 *)
CROSSREFS
KEYWORD
nonn,base,hard,more
AUTHOR
Patrick De Geest, Aug 15 1999
EXTENSIONS
Offset changed to 1 by Jinyuan Wang, Sep 04 2021
STATUS
approved