A050678 Index of first occurrence of n in A048288.
82, 2, 5, 8, 9, 15, 17, 30, 26, 18, 91, 53
Offset: 1
Links
- Patrick De Geest, Reversed Smarandache Concatenated Numbers, Prime factors from n down to 1
- 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 and Problems Connection.
Programs
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Mathematica
Join[{1},Table[i=1; While[PrimeOmega[FromDigits[Flatten[IntegerDigits[Range[i,1,-1]]]]]!=n,i++]; i,{n,2,10}]] (* Jayanta Basu, May 30 2013 *)
Extensions
a(11)-a(12) from Sean A. Irvine, Aug 17 2021
Edited by N. J. A. Sloane, Sep 04 2021