A110782 - OEIS

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A110782

Copies of 1,3,7 and 9 cyclically such that every partial concatenation is a prime.

11, 3, 777, 999, 11, 33333333, 777777777777777777777, 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999, 1111111111111111111111111

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

11, 113, 113777, 113777999, ... are all prime.

CROSSREFS

Cf. A110774, A110775, A110776, A110777, A110778, A110780, A110781, A110783.

Sequence in context: A157781 A069869 A079841 * A088073 A352162 A010187

Adjacent sequences: A110779 A110780 A110781 * A110783 A110784 A110785

KEYWORD