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A110790 Copies of 3 and 1 alternately such that every partial concatenation is a prime. 3
3, 1, 3, 111111111111111, 33333, 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111, 3333, 111111111111111111111111111, 33333 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The next term has 168 digits. [From 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

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Last modified September 27 03:21 EDT 2020. Contains 337380 sequences. (Running on oeis4.)