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.
%I A083984 #11 Sep 29 2024 21:10:31 %S A083984 13,14,16,17,19,23,25,29,31,32,34,35,37,38,41,43,47,49,52,53,56,58,59, %T A083984 61,65,67,71,73,74,76,79,83,85,89,91,92,94,95,97,98,112,113,115,116, %U A083984 118,119,121,122,131,133,151,155,166,181,188,191,199,211,212,221,223,227 %N A083984 If k is a number with exactly two distinct decimal digits, say a and b, neither of which is 0 (i.e., a member of A101594), define the self-complement of k, SC(k), to be the number obtained by replacing a with b and vice versa. E.g. SC(232233) = 323322. Sequence contains numbers n such that n and SC(n) are relatively prime. %e A083984 25 is a member as 25 and 52 are relatively prime, but 24 is not a member as 24 and 42 are not coprime. %Y A083984 Cf. A083983, A083985, A083986. %K A083984 base,nonn %O A083984 1,1 %A A083984 _Amarnath Murthy_, May 22 2003 %E A083984 More terms from _David Wasserman_, Dec 07 2004 %E A083984 Offset corrected by _Andrew Howroyd_, Sep 29 2024