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Search: id:A095678
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| A095678 |
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Minimal sequence such that all triples of consecutive numbers have no common divisor greater than 1, but all three pairs within the triples are not coprime. |
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1
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| 6, 10, 15, 12, 20, 45, 18, 40, 75, 24, 50, 135, 36, 80, 225, 48, 100, 375, 54, 160, 405, 72, 200, 675, 96, 250, 1125, 108, 320, 1215, 144, 400, 1875, 162, 500, 2025, 192, 640, 3375, 216, 800, 3645, 288, 1000, 5625, 324, 1250, 6075, 384, 1280, 9375, 432
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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GCD(a(n),a(n+1),a(n+2)) = 1, GCD(a(n),a(n+1)) > 1, GCD(a(n),a(n+2)) > 1, and GCD(a(n+1),a(n+2)) > 1;
A001221(a(n)) = 2; 2 <= A020639(a(n)) <= 3 <= A006530(a(n)) <= 5.
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CROSSREFS
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Sequence in context: A129119 A074980 A059218 this_sequence A094564 A006987 A080255
Adjacent sequences: A095675 A095676 A095677 this_sequence A095679 A095680 A095681
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 04 2004
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