A088073 - OEIS

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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

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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