A036934 Smallest n-digit prime containing only digits 1 and 7, or 0 if no such prime exists.

7, 11, 0, 1117, 11117, 0, 1111711, 11111117, 0, 1111117171, 11111111771, 0, 1111111111177, 11111111171177, 0, 1111111111171177, 11111111111111171, 0, 1111111111111111111, 11111111111111117111, 0, 1111111111111111111711

Offset

1,1

Links

Jinyuan Wang, Table of n, a(n) for n = 1..1000

Mathematica

Flatten[Table[Select[FromDigits/@Tuples[{1, 7}, n], PrimeQ, 1], {n, 25}]/.{}->{0}] (* Jinyuan Wang, Mar 09 2020 *)

Crossrefs

Cf. A020455, A036307, A036229.

Sequence in context: A282038 A133346 A091920 * A070421 A213671 A050081

Adjacent sequences: A036931 A036932 A036933 * A036935 A036936 A036937

Keyword

nonn,base

Author

Patrick De Geest, Jan 04 1999

Extensions

a(16) corrected by Jinyuan Wang, Mar 09 2020

Status

approved