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 A057659 #27 Feb 11 2025 02:28:02 %S A057659 5,7,11,109,173,81619 %N A057659 Prime numbers whose square is composed of just two different decimal digits. %C A057659 Conjectured to be a finite sequence. %C A057659 No further terms up to prime(1000000)=15485863. - _Harvey P. Dale_, Mar 20 2011 %D A057659 Related to the Unsolved problem F24, p. 262, of the UPiNT by _R. K. Guy_ %e A057659 81619^2 = 6661661161. %p A057659 filter:= p -> nops(convert(convert(p^2,base,10),set))= 2: %p A057659 select(filter, [seq(ithprime(i),i=1..10^5)]); # _Robert Israel_, Feb 11 2025 %t A057659 Select[Prime[Range[10000]],Count[DigitCount[#^2],0] ==8&] (* _Harvey P. Dale_, Mar 20 2011 *) %o A057659 (PARI) select(x->#Set(digits(x^2))==2, primes(10000)) \\ _Michel Marcus_, Feb 11 2025 %Y A057659 Subsequence of A016069. %Y A057659 Cf. A235154. %K A057659 nonn,base,more %O A057659 1,1 %A A057659 _Carlos Rivera_, Oct 15 2000