login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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. 0
11, 2, 33, 444, 55, 6, 777777777777 (list; graph; refs; listen; history; text; internal format)
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: A077344 A298439 A095157 * A089365 A130217 A096044

Adjacent sequences:  A110764 A110765 A110766 * A110768 A110769 A110770

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Aug 12 2005

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 13 20:25 EDT 2021. Contains 345009 sequences. (Running on oeis4.)