A044093 Numbers n such that string 3,1 occurs in the base 5 representation of n but not of n-1.

16, 41, 66, 80, 91, 116, 141, 166, 191, 205, 216, 241, 266, 291, 316, 330, 341, 366, 391, 400, 441, 455, 466, 491, 516, 541, 566, 580, 591, 616, 641, 666, 691, 705, 716, 741, 766, 791, 816, 830, 841, 866, 891, 916, 941, 955, 966