This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
a(1) = 0 = 0_6 = 0_7 a(2) = 1 = 1_6 = 1_7 a(3) = 2 = 2_6 = 2_7 a(4) = 3 = 3_6 = 3_7 a(5) = 4 = 4_6 = 4_7 a(6) = 5 = 5_6 = 5_7 a(7) = 8 = 12_6 = 11_7 a(8) = 9 = 13_6 = 12_7 a(9) = 10 = 14_6 = 13_7 a(10) = 11 = 15_6 = 14_7 a(11) = 16 = 24_6 = 22_7 a(12) = 17 = 25_6 = 23_7 a(13) = 57 = 133_6 = 111_7 a(14) = 58 = 134_6 = 112_7 a(15) = 59 = 135_6 = 113_7 a(16) = 65 = 145_6 = 122_7 a(17) = 89 = 225_6 = 155_7 a(18) = 130 = 334_6 = 244_7 a(19) = 131 = 335_6 = 245_7 a(20) = 172 = 444_6 = 334_7 a(21) = 173 = 445_6 = 335_7 a(22) = 179 = 455_6 = 344_7 a(23) = 1600 = 11224_6 = 4444_7 a(24) = 1601 = 11225_6 = 4445_7 a(25) = 3203 = 22455_6 = 12224_7
Sequence includes 7 terms that are 1-digit numbers in both bases, 9 terms that are 2-digit numbers in both bases, and the following: a(17) = 73 = 133_7 = 111_8 a(18) = 74 = 134_7 = 112_8 a(19) = 75 = 135_7 = 113_8 a(20) = 76 = 136_7 = 114_8 a(21) = 82 = 145_7 = 122_8 a(22) = 83 = 146_7 = 123_8 a(23) = 118 = 226_7 = 166_8 a(24) = 146 = 266_7 = 222_8 a(25) = 173 = 335_7 = 255_8 a(26) = 174 = 336_7 = 256_8 a(27) = 228 = 444_7 = 344_8 a(28) = 229 = 445_7 = 345_8 a(29) = 230 = 446_7 = 346_8 a(30) = 237 = 456_7 = 355_8 a(31) = 293 = 566_7 = 445_8 a(32) = 587 = 1466_7 = 1113_8 a(33) = 685 = 1666_7 = 1255_8 a(34) = 804 = 2226_7 = 1444_8 a(35) = 2925 = 11346_7 = 5555_8 a(36) = 14062 = 55666_7 = 33356_8 a(37) = 42131 = 233555_7 = 122223_8 a(38) = 42132 = 233556_7 = 122224_8 a(39) = 42139 = 233566_7 = 122233_8 a(40) = 411942 = 3333666_7 = 1444446_8
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