A043979 Numbers n such that 2 and 7 occur juxtaposed in the base 9 representation of n but not of n+1.

25, 65, 106, 146, 187, 233, 268, 308, 349, 389, 430, 470, 511, 551, 593, 632, 673, 713, 754, 794, 835, 875, 916, 962, 997, 1037, 1078, 1118, 1159, 1199, 1240, 1280, 1322, 1361, 1402, 1442, 1483, 1523, 1564, 1604, 1645, 1691