A050681 Positions of 4's in A048288.
8, 14, 16, 19, 21, 23, 37, 57, 67, 70, 79, 88, 106
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(9)-a(13) from Sean A. Irvine, Aug 17 2021
Offset changed to 1 by Jinyuan Wang, Sep 04 2021