The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A258214

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A258214

Primes formed by concatenating p^2 with q, where p, q are consecutive primes.
(history; published version)

#13 by Charles R Greathouse IV at Thu Sep 08 08:46:12 EDT 2022

PROG

(MAGMAMagma) [m: n in [1..300] | IsPrime(m) where m is Seqint(Intseq(NthPrime(n+1)) cat Intseq(NthPrime(n)^2))]; // Vincenzo Librandi, May 24 2015

Discussion

Thu Sep 08

08:46

OEIS Server: https://oeis.org/edit/global/2944

#12 by Harvey P. Dale at Mon Dec 05 11:03:28 EST 2016

STATUS

editing

approved

#11 by Harvey P. Dale at Mon Dec 05 11:03:23 EST 2016

MATHEMATICA

Select[#[[1]]^2*10^IntegerLength[#[[2]]]+#[[2]]&/@Partition[Prime[ Range[ 300]], 2, 1], PrimeQ] (* Harvey P. Dale, Dec 05 2016 *)

STATUS

approved

editing

#10 by Alois P. Heinz at Sun May 24 09:58:29 EDT 2015

STATUS

editing

approved

#9 by Alois P. Heinz at Sun May 24 09:58:23 EDT 2015

EXAMPLE

a(2) = 257 is prime formed by concatenation of (5^2), = 25 with 7.

a(3) = 12113 is prime formed by concatenation of (11^2), = 121 with 13.

STATUS

proposed

editing

#8 by Vincenzo Librandi at Sun May 24 01:36:11 EDT 2015

STATUS

editing

proposed

#7 by Vincenzo Librandi at Sun May 24 01:35:53 EDT 2015

PROG

(MAGMA) [m: n in [1..300] | IsPrime(m) where m is Seqint(Intseq(NthPrime(n+1)) cat Intseq(NthPrime(n)^2))]; // Vincenzo Librandi, May 24 2015

STATUS

proposed

editing

#6 by K. D. Bajpai at Sat May 23 20:58:46 EDT 2015

STATUS

editing

proposed

Discussion

Sat May 23

21:03

K. D. Bajpai: keyword: base added.

#5 by K. D. Bajpai at Sat May 23 20:58:24 EDT 2015

KEYWORD

nonn,base,changed

STATUS

proposed

editing

#4 by K. D. Bajpai at Sat May 23 15:40:23 EDT 2015

STATUS

editing

proposed

Discussion

Sat May 23

16:57

Michel Marcus: concatenation : so keyword base