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 A090891 30*a(n) is the gap between sexy prime triples in the n-th sexy prime triple triple whose initial term is 17. 0
 18, 21, 49, 130, 1383, 2660, 3245, 5730, 9569, 10735, 11018, 12054, 13528, 18249, 19222, 21483, 22029, 31665, 31899, 37804, 40576, 59322, 59353, 59966, 65020, 65972, 73843, 80938, 82716, 84445, 85365, 89866, 92586, 103639, 105158, 107149 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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 ]. LINKS EXAMPLE a(2)=21 identifies the second sexy prime triple triple whose initial term is 17: {{17, 23, 29}, {17+30*21, 23+30*21, 29+30*21}, {17+2*30*21, 23+2*30*21, 29+2*30*21}} which is equal to {{17, 23, 29}, {647, 653, 659}, {1277, 1283, 1289}}. CROSSREFS Cf. A023201, A046117. Sequence in context: A244603 A120416 A293751 * A303298 A358592 A121851 Adjacent sequences: A090888 A090889 A090890 * A090892 A090893 A090894 KEYWORD nonn AUTHOR Ray G. Opao, Feb 16 2004 STATUS approved

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Last modified November 27 22:56 EST 2022. Contains 358406 sequences. (Running on oeis4.)