A023097 a(n) is least k such that k and 5k are anagrams in base n (written in base 10).
245, 2985, 525, 1208, 142857, 20, 2970, 21, 3419, 69034, 11220, 24, 459, 9720, 25935, 55, 13671, 88, 52900, 630, 21775, 535483, 22113, 35, 2175, 35520, 1240, 43520, 102795, 204, 1505, 171, 253783, 2660, 112008, 140, 6027, 89208, 96105, 253, 547515
Offset: 6