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A131749
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Triangle of successive absolute differences of semiprimes.
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0
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4, 2, 6, 1, 3, 9, 1, 2, 1, 10, 0, 1, 3, 4, 14, 1, 1, 0, 3, 1, 15, 0, 1, 2, 2, 5, 6, 21, 1, 1, 0, 2, 0, 5, 1, 22, 1, 0, 1, 1, 3, 3, 2, 3, 25, 1, 0, 0, 1, 0, 3, 0, 2, 1, 26, 1, 0, 0, 0, 1, 1, 4, 4, 6, 7, 33, 1, 0, 0, 0, 0, 1, 0, 4, 0, 6, 1, 34, 0, 1, 1, 1, 1, 1, 2, 2, 6, 6, 0, 1, 35
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Semiprime analogue of A036262. The conjecture analogous to Gilbreath's conjecture is that the leading term (after the second row) is always 0 or 1. First diagonal is semiprimes (A001358). Second diagonal is first differences of semiprimes (A065516).
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EXAMPLE
| Table begins:
4..6..9.10.14.15.21.22.25.26.33.34.35..A001358.
2..3..1..4..1..6..1..3..1..7..1..1.....A065516.
1..2..3..3..5..5..2..2..6..6..0.
1..1..0..2..0..3..0..4..0..6.
0..1..2..2..3..3..4..4..6.
1..1..0..1..0..1..0..2.
0..1..1..1..1..1..2.
1..0..0..0..0..1.
1..0..0..0..1.
1..0..0..1.
1..0..1.
1..1.
0.
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CROSSREFS
| Cf. A001358, A036262, A065516.
Sequence in context: A178394 A091664 A010317 * A016515 A011306 A019719
Adjacent sequences: A131746 A131747 A131748 * A131750 A131751 A131752
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Oct 23 2007
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