A260267 Primes having only {1, 2, 4} as digits.

2, 11, 41, 211, 241, 421, 2111, 2141, 2221, 2411, 2441, 4111, 4211, 4241, 4421, 4441, 11411, 12211, 12241, 12421, 14221, 14411, 21121, 21211, 21221, 22111, 22441, 24121, 24421, 41141, 41221, 41411, 42221, 44111, 44221, 111121, 111211, 112111, 112121, 112241

Offset: 1

Author

Vincenzo Librandi, Jul 23 2015

Keywords

• nonn
• easy
• base

Comments

A020450 and A020452 are subsequences.

All terms but the first one end with a digit "1". - M. F. Hasler, Jul 26 2015

Links

• Jason Bard, Table of n, a(n) for n = 1..10000
• Index to entries about primes with digits in a given set.

Crossrefs

Cf. similar sequences listed in A260266.

Cf. A020450, A020452.

Programs

Magma

[p: p in PrimesUpTo(4*10^5) | Set(Intseq(p)) subset [1, 4, 2]];

Mathematica

Select[Prime[Range[3 10^4]], Complement[IntegerDigits[#], {1, 4, 2}]=={} &]

PARI

A260267(n=50,show=0)={for(d=1,1e9,my(t,u=vector(d,i,10^(d-i))~);forvec(v=vector(d,i,[0,if(iM. F. Hasler, Jul 25 2015