The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A260828 Primes that contain only the digits (1, 5, 7). 3

%I

%S 5,7,11,17,71,151,157,557,571,577,751,757,1117,1151,1171,1511,1571,

%T 1777,5171,5557,5711,5717,7151,7177,7517,7577,7717,7757,11117,11171,

%U 11177,11551,11717,11777,15511,15551,17117,17551,51151,51157,51511,51517,51551

%N Primes that contain only the digits (1, 5, 7).

%C A020453, A020455 and A020467 are subsequences.

%C Subsequence of A030096.

%H Alois P. Heinz, <a href="/A260828/b260828.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[2 10^4]], Complement[IntegerDigits[#], {1, 5, 7}] == {} &]

%o (MAGMA) [p: p in PrimesUpTo(2*10^5) | Set(Intseq(p)) subset [1,5,7]];

%Y Cf. similar sequences listed in A260827.

%Y Cf. A000040, A020453, A020455, A020467, A030096.

%K nonn,easy,base

%O 1,1

%A _Vincenzo Librandi_, Aug 02 2015

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 6 01:03 EDT 2021. Contains 343579 sequences. (Running on oeis4.)