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A104227 Primes one less than the sum over a sexy prime pair. 4

%I #6 Jan 04 2020 19:25:18

%S 19,31,67,79,127,139,151,199,211,307,547,619,739,751,919,1087,1231,

%T 1459,1471,1759,1987,2131,2179,2239,2251,2467,2647,2851,2971,3319,

%U 3331,3391,3499,3511,3559,3571,3727,3739,4027,4567,4759,5107,5347,5419,5431,6367,6607,6619,7027,7219,7459

%N Primes one less than the sum over a sexy prime pair.

%C Primes of the form A023201(i)+A046117(i)-1 or of the form 2*A087695(j)-1.

%H Harvey P. Dale, <a href="/A104227/b104227.txt">Table of n, a(n) for n = 1..1000</a>

%e 19=7+13-1 is a prime and one less than the sum 7+13 over the second sexy prime pair.

%t Select[2#+5&/@Select[Prime[Range[600]],PrimeQ[#+6]&],PrimeQ] (* _Harvey P. Dale_, Jan 04 2020 *)

%Y Cf. A023201, A046117, A104228, A104229.

%K easy,nonn

%O 1,1

%A _Giovanni Teofilatto_, Apr 02 2005

%E Corrected definition. Extended beyond a(7). - _R. J. Mathar_, Nov 26 2008

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Last modified April 28 11:50 EDT 2024. Contains 372066 sequences. (Running on oeis4.)