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 A178496 #4 Jan 04 2011 16:06:30 %S A178496 11,11,1212121,133111331,361464163,31501610513,916517717715619, %T A178496 1017178491948717101,111888534121435888111,1967497532357947691, %U A178496 11064247395259374246011,142853116706111607611358241 %N A178496 The smallest palindromic prime which contains the decimal expansion of 11^n in its decimal representation. %C A178496 The entries have two possible formats: a//11^n ( = 11^n//b), where the double-slash denotes concatenation, or c//11^n//d. %C A178496 By definition, the concatenation has to be a palindromic prime, A002385. %e A178496 a(0) = 11^0//1 = 1//1 = palprime(5). %e A178496 a(1) = 11^1 = 11. %e A178496 a(2) = 1212//11^2 = 1212//121 = palprime(151). %e A178496 a(3) = 13311//11^3 = 13311//1331 = palprime(1270). %e A178496 a(4) = 36//11^4//63 = 36//14641//63 = palprime(3035). %e A178496 a(5) = 3150//11^5//3 = 3150//161051//3 = palprime(18465). %e A178496 a(6) = 9165177//11^6//9 = 9165177//1771561//9. %e A178496 a(7) = 101717849//11^7//01 = 101717849//19487171//01. %e A178496 a(8) = 1118885341//11^8//11 = 1118885341//214358881//11. %e A178496 a(9) = 196749753//11^9 = 196749753//2357947691. %e A178496 a(10) = 11064247395//11^10//1 = 11064247395//25937424601//1. %e A178496 a(11) = 14//11^11//1607611358241 = 14//285311670611//1607611358241. %e A178496 a(12) = 111276738248//11^12//11 = 111276738248//3138428376721//11. %Y A178496 Cf. A002385, A001020, A177678 %K A178496 base,nonn %O A178496 0,1 %A A178496 Ulrich Krug (leuchtfeuer37(AT)gmx.de), May 28 2010