A036935 - OEIS

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A036935

Smallest n-digit prime containing only digits 1 and 8, or 0 if no such prime exists.

0, 11, 181, 1181, 18181, 0, 1111181, 11818181, 111111181, 1111111181, 11111188811, 0, 1111111118111, 11111111818181, 111111111111881, 1111111111111181, 11111111111188111, 0, 1111111111111111111

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OFFSET

1,2

COMMENTS

a(6k) = 0 as any 6k-digit number containing only digits 1 or 8 is divisible by 7. - Jinyuan Wang, Mar 09 2020

LINKS

Jinyuan Wang, Table of n, a(n) for n = 1..500

CROSSREFS

Cf. A020456, A036229, A036308.

Sequence in context: A157945 A106907 A020456 * A205088 A241193 A143413

Adjacent sequences: A036932 A036933 A036934 * A036936 A036937 A036938

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Jan 04 1999

STATUS

approved