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 A138869 #5 Mar 14 2020 05:57:16 %S A138869 22,44,1616,6464,4096,6536,2644,1024,1176,3056,8164,8564,3476,2664, %T A138869 5244,7304,2276,1236,9596,1404,2356,1776,1496,2136,2276,2056,4236, %U A138869 2604,2604,2556,3724,8744,6496,2064,4056,3176,6336,2196,4636,6224,1404,6124,1536,6236,1064,8476,1556 %N A138869 Concatenation of first two digits and last two digits of n-th even superperfect number A061652(n). %C A138869 Also, concatenation of first two digits and last two digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers. %Y A138869 Cf. A019279, A061652, A138863, A138867, A138868, A138875. %K A138869 nonn,base %O A138869 1,1 %A A138869 _Omar E. Pol_, Apr 02 2008 %E A138869 More terms from _Jinyuan Wang_, Mar 14 2020