A090535 Least n-digit prime using digit 7 once and rest all 1, or 0 if no such prime exists.

7, 17, 0, 1117, 11117, 0, 1111711, 11111117, 0, 1117111111, 17111111111, 0, 1111171111111, 0, 0, 0, 11111111111111171, 0, 1111111111111111171, 11111111111111117111, 0, 1111111111111111111711, 11111111111111111111117

Offset

1,1

Comments

a(3n) = 0.

Links

Table of n, a(n) for n=1..23.

Example

a(5) = 11117.

Crossrefs

Cf. A090536, A090537, A090538.

Sequence in context: A129422 A184062 A101122 * A107778 A122735 A094464

Adjacent sequences: A090532 A090533 A090534 * A090536 A090537 A090538

Keyword

base,nonn

Author

Amarnath Murthy, Dec 08 2003

Extensions

More terms from David Wasserman, Jan 03 2006

Status

approved