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 A084368 #13 Jun 20 2023 15:55:35 %S A084368 1,2,3,4,9,10,12,14,15,16,17,19,21,22,23,24,25,48,49,50,51,52,55,56, %T A084368 57,59,61,62,63,68,69,70,71,72,73,74,75,76,77,78,80,84,85,86,87,88,90, %U A084368 91,92,93,95,96,97,99,101,102,103,104,106,107,108,109,111,117,118,119,120 %N A084368 Numbers k such that prime(k) does not contain the digit 1. %H A084368 Zak Seidov, <a href="/A084368/b084368.txt">Table of n, a(n) for n = 1..1000</a> %e A084368 99 is a term because prime(99) = 523 is unit-free. %t A084368 Select[ Range[120], Count[ IntegerDigits[ Prime[ # ]], 1] == 0 & ] %t A084368 Select[Range[120],DigitCount[Prime[#],10,1]==0&] (* _Harvey P. Dale_, Jun 20 2023 *) %Y A084368 Cf. A000040, A007498, A038603. %K A084368 easy,nonn,base %O A084368 1,2 %A A084368 _Zak Seidov_, Jun 23 2003 %E A084368 Edited and extended by _Robert G. Wilson v_, Jun 24 2003