A385774 Primes having only {1, 2, 6} as digits.

2, 11, 61, 211, 661, 1621, 2111, 2161, 2221, 2621, 6121, 6211, 6221, 6661, 11161, 11261, 11621, 12161, 12211, 12611, 16111, 16661, 21121, 21211, 21221, 21611, 21661, 22111, 22621, 26111, 26161, 26261, 61121, 61211, 61261, 66161, 66221, 111121, 111211

Offset: 1

Author

Jason Bard, Jul 09 2025

Keywords

• nonn
• base
• easy

Links

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

Crossrefs

Supersequence of A020450, A020454.

Cf. A000040, A385776.

Programs

Magma

[p: p in PrimesUpTo(10^6) | Set(Intseq(p)) subset [1, 2, 6]];

Mathematica

Flatten[Table[Select[FromDigits /@ Tuples[{1, 2, 6}, n], PrimeQ], {n, 7}]]

PARI

primes_with(, 1, [1, 2, 6]) \\ uses function in A385776

Python

print(list(islice(primes_with("126"), 41))) # uses function/imports in A385776