A261184 Primes having only {6, 7, 9} as digits.

7, 67, 79, 97, 677, 769, 797, 967, 977, 997, 6679, 6779, 6967, 6977, 6997, 7669, 7699, 9677, 9679, 9697, 9767, 9769, 9967, 66697, 66797, 66977, 67679, 67699, 67777, 67967, 67979, 69677, 69697, 69767, 69779, 69997, 76667, 76679, 76697, 76777, 77699, 77797

Offset: 1

Author

Vincenzo Librandi, Aug 11 2015

Keywords

• nonn
• easy
• base

Comments

A020469 and A020471 are subsequences.

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..10000
• James Maynard and Brady Haran, Primes without a 7, Numberphile video (2019)
• Index to entries for primes with digits in a given set

Crossrefs

Cf. similar sequences listed in A261181.

Cf. A000040, A020469, A020471.

Programs

Magma

[p: p in PrimesUpTo(2*10^5) | Set(Intseq(p)) subset [6, 7, 9]];

Mathematica

Select[Prime[Range[6 10^4]], Complement[IntegerDigits[#], {6, 7, 9}] == {} &]
Select[Flatten[Table[FromDigits/@Tuples[{6,7,9},n],{n,5}]],PrimeQ] (* Harvey P. Dale, Jun 18 2021 *)