A050678 Index of first occurrence of n in A048288.

82, 2, 5, 8, 9, 15, 17, 30, 26, 18, 91, 53

Offset

1,1

Links

Table of n, a(n) for n=1..12.

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.

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 *)

Crossrefs

Cf. A000422, A050676, A048288.

Sequence in context: A352032 A051001 A363991 * A354501 A033402 A143757

Adjacent sequences: A050675 A050676 A050677 * A050679 A050680 A050681

Keyword

nonn,base,hard,more

Author

Patrick De Geest, Aug 15 1999

Extensions

a(11)-a(12) from Sean A. Irvine, Aug 17 2021

Edited by N. J. A. Sloane, Sep 04 2021

Status

approved