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A050679
Positions of 2's in A048288.
4
2, 3, 4, 6, 7, 11
OFFSET
1,1
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