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A090535 Least n-digit prime using digit 7 once and rest all 1, or 0 if no such prime exists. 3
7, 17, 0, 1117, 11117, 0, 1111711, 11111117, 0, 1117111111, 17111111111, 0, 1111171111111, 0, 0, 0, 11111111111111171, 0, 1111111111111111171, 11111111111111117111, 0, 1111111111111111111711, 11111111111111111111117 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)