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!)
A126095 Lesser of pairs of single (non-twin) primes. 1

%I #6 Sep 17 2023 11:08:49

%S 47,79,83,89,113,127,157,163,167,211,251,257,293,317,331,353,359,367,

%T 373,379,383,389,397,401,439,443,449,467,479,487,491,499,503,541,547,

%U 557,577,587,607,647,673,677,683,691,701,709,719,727,733,739,743,751

%N Lesser of pairs of single (non-twin) primes.

%C Primes p such that p-/+2, nextprime(p)-/+2 are not primes. Cf. A007510 Single (or isolated or non-twin) primes.

%H Harvey P. Dale, <a href="/A126095/b126095.txt">Table of n, a(n) for n = 1..1000</a>

%e 47 and 53 are two consecutive primes while 47-/+2, 53-/+2 are not primes;

%e 79 and 83 are two consecutive primes while 79-/+2, 83-/+2 are not primes.

%t sntpQ[{a_,b_}]:=NoneTrue[Flatten[{a+{2,-2},b+{2,-2}}],PrimeQ]; Transpose[ Select[ Partition[ Prime[Range[200]],2,1],sntpQ]][[1]] (* The program uses the NoneTrue function from Mathematica version 10 *) (* _Harvey P. Dale_, Jul 22 2016 *)

%Y Cf. A007510.

%K nonn

%O 1,1

%A _Zak Seidov_, Mar 03 2007

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 March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)