A088073 Beginning with 11 (concatenation of 1 twice), smallest number which is a concatenation of itself as many (say k) times required, chosen from odd numbers not == 5 (mod 10), in natural order, so that every partial concatenation is prime.

11, 3, 777, 999, 11, 131313131313131313131313131313131313131313

Offset

0,1

Comments

Numbers chosen are from 1,3,7,9,11,13,17,19,21,23,27,29,... which can produce primes.

Next term has > 2000 digits and is too large to include. - David Wasserman, Jul 01 2005

Links

Table of n, a(n) for n=0..5.

Crossrefs

Cf. A088074.

Sequence in context: A069869 A079841 A110782 * A352162 A010187 A372761

Adjacent sequences: A088070 A088071 A088072 * A088074 A088075 A088076

Keyword

base,nonn

Author

Amarnath Murthy, Sep 22 2003

Extensions

More terms from David Wasserman, Jul 01 2005

Status

approved