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!)
A068701 Primes in the concatenation n^2, n and 1. 2
421, 2551, 6481, 8191, 289171, 729271, 1024321, 1521391, 1681411, 3136561, 3600601, 4225651, 4356661, 4624681, 5184721, 6084781, 7921891, 9604981, 116641081, 136891171, 144001201, 163841281, 174241321 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

6481 is a prime which is a concatenation of 8^2, 8 and 1.

MATHEMATICA

Select[Table[FromDigits[Flatten[{IntegerDigits[n^2], IntegerDigits[n], {1}}]], {n, 1000}], PrimeQ] (* Vincenzo Librandi, Mar 13 2013 *)

PROG

(MAGMA) [nn1: n in [1..200] | IsPrime(nn1) where nn1 is Seqint([1] cat Intseq(n) cat Intseq(n^2))]; // Vincenzo Librandi, Mar 13 2013

CROSSREFS

Sequence in context: A023353 A142853 A217587 * A302284 A302732 A251198

Adjacent sequences:  A068698 A068699 A068700 * A068702 A068703 A068704

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Mar 04 2002

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 August 11 23:45 EDT 2020. Contains 336434 sequences. (Running on oeis4.)