A110782 - OEIS

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A110782

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

12

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

base,nonn

AUTHOR

Amarnath Murthy, Aug 12 2005

EXTENSIONS

More terms from Joshua Zucker, Jan 11 2006

The next term is 726 3's and is too large to include.

STATUS

approved