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A090776 30*a(n) is the gap between sexy prime triples in the n-th sexy prime triple triple whose initial term is 7. 0

%I #5 Jan 19 2019 04:15:43

%S 12,24,55,62,90,262,1090,1245,1459,2057,3043,3296,7390,11625,13961,

%T 26423,27557,29833,48809,55711,68794,70180,72554,78025,84654,108590,

%U 112321,117995,147101,160730,176889,180829,184182,203586,204116,217587

%N 30*a(n) is the gap between sexy prime triples in the n-th sexy prime triple triple whose initial term is 7.

%C The nine terms in any sexy prime triple triple {{a, b, c}, {d, e, f}, {g, h, i}} may be arranged to form a 3 X 3 magic square [ h a f / c e g / d i b ].

%e a(2)=24 identifies the second sexy prime triple triple whose initial term is 7: {{7, 13, 19}, {7+30*24, 13+30*24, 19+30*24}, {7+2*30*24, 13+2*30*24, 19+2*30*24}} which is equal to {{7, 13, 19}, {727, 733, 739}, {1447, 1453, 1459}}.

%Y Cf. A023201, A046117.

%K nonn

%O 1,1

%A _Ray G. Opao_, Feb 08 2004

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)