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A127589 Primes of the form 16k + 5. 13

%I #16 Oct 24 2022 15:25:04

%S 5,37,53,101,149,181,197,229,277,293,373,389,421,613,661,677,709,757,

%T 773,821,853,997,1013,1061,1093,1109,1237,1301,1381,1429,1493,1621,

%U 1637,1669,1733,1861,1877,1973,2053,2069,2213,2293,2309,2341,2357,2389,2437

%N Primes of the form 16k + 5.

%C All terms are the sum of two squares.

%C Primes with least significant digit 5 in hexadecimal. - _Alonso del Arte_, Oct 21 2022

%H T. D. Noe, <a href="/A127589/b127589.txt">Table of n, a(n) for n=1..1000</a>

%t a = {}; Do[If[PrimeQ[16n + 5], AppendTo[a, 16n + 5]], {n, 0, 200}]; a

%t Select[16Range[200] + 5, PrimeQ] (* _Alonso del Arte_, Oct 21 2022 *)

%o (PARI) select(x->(x%16)==5, primes(500)) \\ _Michel Marcus_, Oct 24 2022

%Y Cf. A035050, A007522, A127575, A127576, A127577, A127578, A127580, A127581, A087522, A127586, A127587.

%K nonn,easy

%O 1,1

%A _Artur Jasinski_, Jan 19 2007

%E Invalid comment removed by _Zak Seidov_, Jul 22 2010

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)