[seqfan] relation A033984 and A173138, solutions of mod n equations

[Richard Mathar]

How are these two sequences related?

http://research.att.com/~njas/sequences/?q=id:A173138|id:A033984

4,40369,673663,990409,1697609,2073127,6462649,7527199,7559479,14421169,21484129,37825753,57233047,

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