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!)
A095649 Primes p = p_(n+1) such that p_n + p_(n+2) = 2*p_(n+1) + 8. 8

%I #11 Jul 14 2015 23:17:41

%S 139,181,241,283,421,467,811,829,953,1021,1051,1153,1259,1307,1699,

%T 1723,1831,1879,2029,2089,2143,2221,2251,2297,2357,2423,2621,2731,

%U 3001,3191,3347,3361,3583,3769,3823,3853,4139,4219,4231,4243,4261,4273,4339,4373

%N Primes p = p_(n+1) such that p_n + p_(n+2) = 2*p_(n+1) + 8.

%C Primes that are second prime chords.

%C These come from music based on the prime differences where the chords are an even number of note steps from the primary note.

%H Harvey P. Dale, <a href="/A095649/b095649.txt">Table of n, a(n) for n = 1..1000</a>

%t m = 2; Prime[ 1 + Select[ Range[600], Prime[ # + 2] - 2*Prime[ # + 1] + Prime[ # ] - 4*m == 0 &]] (* _Robert G. Wilson v_, Jul 14 2004 *)

%t Transpose[Select[Partition[Prime[Range[600]],3,1],#[[1]]+#[[3]]==2#[[2]]+ 8&]][[2]] (* _Harvey P. Dale_, Feb 26 2015 *)

%Y Cf. A095419, A095420, A095648, A095650, A095651, A095672, A095673.

%K nonn

%O 1,1

%A _Roger L. Bagula_, Jul 02 2004

%E Edited by _Robert G. Wilson v_, Jul 14 2004

%E Description corrected by _N. J. A. Sloane_, Jul 19 2004

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 April 18 09:47 EDT 2024. Contains 371779 sequences. (Running on oeis4.)