A050680 Positions of 3's in A048288.
5, 10, 12, 13, 31, 38, 43, 49, 51, 55, 59, 60, 76, 83, 85, 97, 117, 118
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.
Extensions
a(13)-a(16) from Sean A. Irvine, Aug 17 2021
Offset changed to 1 by and a(17)-a(18) from Jinyuan Wang, Sep 04 2021