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 A285040 #15 Oct 12 2017 17:02:14 %S A285040 4356,43956,439956,4399956,43564356,43999956,435604356,439999956, %T A285040 4356004356,4395643956,4399999956,43560004356,43956043956,43999999956, %U A285040 435600004356,435643564356,439560043956,439956439956,439999999956 %N A285040 Numbers n such that three-halves of n equals the reverse of n. %C A285040 There are Fibonacci(floor((n-2)/2)) terms with n digits (this is essentially A103609). - _Ray Chandler_, Oct 12 2017 %D A285040 David Wells, The Penguin Dictionary of Curious and Interesting Numbers (Rev. ed. 1997), p. 158. %H A285040 Ray Chandler, <a href="/A285040/b285040.txt">Table of n, a(n) for n = 1..10000</a> %e A285040 439956 times 3/2 equals 659934 which is the reverse of 439956. %t A285040 Select[2 Range[10^7], 3(#/2) == FromDigits@ Reverse@ IntegerDigits@ # &] (* _Giovanni Resta_, Apr 08 2017 *) %o A285040 (PARI) isok(n) = 3*n/2 == fromdigits(Vecrev(digits(n))); \\ _Michel Marcus_, Apr 09 2017 %Y A285040 Cf. A101704, A101705, A101706, A001232, A008918. %K A285040 nonn,base %O A285040 1,1 %A A285040 _Harvey P. Dale_, Apr 08 2017 %E A285040 Data corrected by _Giovanni Resta_, Apr 08 2017