login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A088619 Numbers k such that the concatenation of 1, k and k^2 is prime. 2
3, 11, 21, 29, 39, 47, 59, 69, 101, 111, 131, 149, 171, 183, 197, 213, 231, 243, 249, 251, 297, 299, 317, 323, 329, 369, 387, 401, 411, 423, 431, 461, 501, 521, 527, 533, 537, 539, 543, 593, 651, 657, 669, 717, 741, 743, 779, 819, 867, 869, 873, 897, 939, 981 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
3 is a member as 139 is a prime. 11 is a member as 111121 (concatenation of 1,11 and 121) is prime.
MATHEMATICA
Select[ Range[1000], PrimeQ[ FromDigits[ Join[ IntegerDigits[ #^0], IntegerDigits[ # ], IntegerDigits[ #^2]]]] &]
CROSSREFS
Cf. A068702.
Sequence in context: A363012 A006876 A031239 * A031318 A082485 A322595
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Oct 17 2003
EXTENSIONS
Edited and extended by Robert G. Wilson v and Ray Chandler, Oct 18 2003
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 21 21:26 EDT 2024. Contains 374475 sequences. (Running on oeis4.)