A386099 Primes having only {1, 2, 6, 7} as digits.

2, 7, 11, 17, 61, 67, 71, 127, 167, 211, 227, 271, 277, 617, 661, 677, 727, 761, 1117, 1171, 1217, 1277, 1621, 1627, 1667, 1721, 1777, 2111, 2161, 2221, 2267, 2617, 2621, 2671, 2677, 2711, 2767, 2777, 6121, 6211, 6217, 6221, 6271, 6277, 6661, 6761, 7121, 7127

Offset: 1

Author

Jason Bard, Jul 17 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 A260889, A260891, A385774, A385787.

Cf. A000040, A385776.

Programs

Magma

[p: p in PrimesUpTo(10^6) | Set(Intseq(p)) subset [1, 2, 6, 7]];

Mathematica

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

PARI

primes_with(, 1, [1, 2, 6, 7]) \\ uses function in A385776

Python

print(list(islice(primes_with("1267"), 41))) # uses function/imports in A385776