A110767 a(1) = 11 then the least number of concatenation of n that gives prime when placed on the most significant side of the previous concatenation.

11, 2, 33, 444, 55, 6, 777777777777

Offset

1,1

Comments

Contribution from David Wasserman, Dec 30 2008: (Start)

Next term has 634 digits.

A088061 gives the primes. (End)

Links

Table of n, a(n) for n=1..7.

Example

11,211,33211,44433211,5544433211,... are all primes.

Crossrefs

Cf. A088061. [From David Wasserman, Dec 30 2008]

Sequence in context: A364697 A298439 A095157 * A089365 A130217 A096044

Adjacent sequences: A110764 A110765 A110766 * A110768 A110769 A110770

Keyword

base,nonn

Author

Amarnath Murthy, Aug 12 2005

Status

approved