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 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 * A340157 A302284 A353045 Adjacent sequences: A068698 A068699 A068700 * A068702 A068703 A068704 KEYWORD base,nonn AUTHOR Amarnath Murthy, Mar 04 2002 STATUS approved

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Last modified August 14 23:14 EDT 2024. Contains 375171 sequences. (Running on oeis4.)