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 A045642 #20 Jul 07 2025 04:03:02 %S A045642 0,7,77,161,252,343,434,525,595,616,686,707,777,868,959,1001,1771, %T A045642 2002,2772,3003,3773,4004,4774,5005,5775,6006,6776,7007,7777,8008, %U A045642 8778,9009,9779,10101,10801,11011,11711,12621,13531,14441,15351,16261,16961 %N A045642 Palindromic and divisible by 7. %H A045642 Paolo Xausa, <a href="/A045642/b045642.txt">Table of n, a(n) for n = 1..2000</a> %t A045642 Select[Range[0, 21000, 7], PalindromeQ] (* _Paolo Xausa_, Jul 06 2025 *) %Y A045642 Intersection of A002113 and A008589. %Y A045642 Cf. A029951, A045638, A045639, A043040, A045641, A045643, A045644, A083852. %K A045642 nonn,base %O A045642 1,2 %A A045642 _Jeff Burch_ %E A045642 a(1) = 0 prepended by _Paolo Xausa_, Jul 07 2025