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A260382 Primes that contain only the digits (3, 7, 9). 3

%I #13 Sep 08 2022 08:46:13

%S 3,7,37,73,79,97,337,373,379,397,733,739,773,797,937,977,997,3373,

%T 3733,3739,3779,3793,3797,7333,7393,7793,7933,7937,7993,9337,9377,

%U 9397,9733,9739,9973,33377,33739,33773,33797,33937,33997,37337,37339,37379,37397

%N Primes that contain only the digits (3, 7, 9).

%C A020463 and A020471 are subsequences.

%H Alois P. Heinz, <a href="/A260382/b260382.txt">Table of n, a(n) for n = 1..10000</a>

%H James Maynard and Brady Haran, <a href="https://www.youtube.com/watch?v=eeoBCS7IEqs">Primes without a 7</a>, Numberphile video (2019)

%t Select[Prime[Range[5*10^3]], Complement[IntegerDigits[#], {3, 7, 9}]=={} &]

%o (Magma) [p: p in PrimesUpTo(2*10^5) | Set(Intseq(p)) subset [3,7,9]];

%Y Cf. similar sequences listed in A260378.

%Y Cf. A000040, A020463, A020471.

%K nonn,easy,base

%O 1,1

%A _Vincenzo Librandi_, Aug 01 2015

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Last modified March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)