A050687 Numbers k such that A000422(k) is squarefree.

1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 16, 19, 20, 21, 22, 23, 24, 25, 28, 29, 30, 31, 32, 33, 34, 37, 38, 39, 40, 41, 42, 43, 46, 47, 48, 49, 50, 51, 52, 55, 57, 58, 59, 60, 61, 64, 65, 66, 67, 68, 69, 70, 73, 74, 75, 76, 77, 78, 79, 82, 83, 84, 85, 86, 87

Offset

1,2

Links

Table of n, a(n) for n=1..67.

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 & Problems Connection.

Crossrefs

Cf. A000422, A048288, A048342, A050675, A050688.

Sequence in context: A329298 A074946 A279455 * A098908 A097296 A131616

Adjacent sequences: A050684 A050685 A050686 * A050688 A050689 A050690

Keyword

nonn,base,hard

Author

Patrick De Geest, Aug 15 1999

Extensions

More terms from and name clarified by Sean A. Irvine, Aug 17 2021

Offset changed to 1 by Jinyuan Wang, Sep 04 2021

Status

approved