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 A288040 #27 May 10 2020 04:30:42 %S A288040 10,12,13,14,15,16,17,18,19,20,21,23,24,25,26,27,28,29,30,31,32,34,35, %T A288040 36,37,38,39,40,41,42,43,45,46,47,48,49,50,51,52,53,54,56,57,58,59,60, %U A288040 61,62,63,64,65,67,68,69,70,71,72,73,74,75,76,78,79,80,81,82,83,84,85,86,87,89,90,91,92,93,94,95,96,97,98,100,101 %N A288040 Integers whose number of distinct decimal digits is prime. %C A288040 Differs from A139819 (which contains, for example, 1234, a number with 4 distinct decimal digits). - _R. J. Mathar_, Jun 14 2017 %t A288040 Select[Range@ 101, PrimeQ@ Count[DigitCount[#], _?(# != 0 &)] &] (* _Michael De Vlieger_, Jun 06 2017 *) %o A288040 (Python) %o A288040 from sympy import isprime %o A288040 print([n for n in range(1, 100) if isprime(len(set(str(n))))]) %o A288040 (PARI) isok(m) = isprime(#Set(digits(m))); \\ _Michel Marcus_, May 10 2020 %Y A288040 Union of A031955 and A031962 and .... %K A288040 base,nonn %O A288040 1,1 %A A288040 _Jonathan Frech_, Jun 04 2017