|
%I #23 Sep 04 2021 10:03:49
%S 82,2,5,8,9,15,17,30,26,18,91,53
%N Index of first occurrence of n in A048288.
%H Patrick De Geest, <a href="http://www.worldofnumbers.com/revfact.htm">Reversed Smarandache Concatenated Numbers, Prime factors from n down to 1</a>
%H M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/michafleuren.htm">Factors and primes of Smarandache sequences</a>.
%H M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/micha.txt">Smarandache Factors and Reverse factors</a>
%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_008.htm">Puzzle 8. Primes by Listing</a>, The Prime Puzzles and Problems Connection.
%t 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 *)
%Y Cf. A000422, A050676, A048288.
%K nonn,base,hard,more
%O 1,1
%A _Patrick De Geest_, Aug 15 1999
%E a(11)-a(12) from _Sean A. Irvine_, Aug 17 2021
%E Edited by _N. J. A. Sloane_, Sep 04 2021
|
