A110790 Copies of 3 and 1 alternately such that every partial concatenation is a prime.

3, 1, 3, 111111111111111, 33333, 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111, 3333, 111111111111111111111111111, 33333

Offset

1,1

Comments

The next term has 168 digits. - Charles R Greathouse IV, Sep 29 2008

Links

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

Example

3, 31, 313, 313111111111111111, ... are all prime.

Crossrefs

Cf. A110774, A110775, A110776, A110777, A110778, A110779, A110780, A110781, A110782, A110783, A110788, A110789, A110791.

Sequence in context: A067009 A229755 A257634 * A119719 A125162 A174382

Adjacent sequences: A110787 A110788 A110789 * A110791 A110792 A110793

Keyword

base,easy,nonn

Author

Amarnath Murthy, Aug 13 2005

Extensions

a(6)-a(9) from_Charles R Greathouse IV_, Sep 29 2008

Status

approved