A033984 Odd integers n such that 2^n == 16 (mod n).

1, 7, 40369, 673663, 990409, 1697609, 2073127, 6462649, 7527199, 7559479, 14421169, 21484129, 37825753, 57233047, 130647919, 141735559, 179203369, 188967289, 218206489, 259195009, 264538057, 277628449, 330662479, 398321239, 501126487

Offset: 1

Author

Joe K. Crump (joecr(AT)carolina.rr.com)

Keywords

• nonn

Comments

The odd terms of A015924.

For all m, 2^A128121(m)-1 belongs to this sequence.

Links

• Max Alekseyev, Table of n, a(n) for n = 1..790 (all terms below 10^14)

Crossrefs

Besides initial terms, the sequence coincides with A173138.

Cf. A015924, A173138, A173572.

Programs

Mathematica

Select[Range[1,510000001,2],PowerMod[2,#,#]==16&] (* Harvey P. Dale, Dec 11 2010 *)

Extensions

Edited and terms 1,7 prepended by Max Alekseyev, Aug 09 2012