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Search: id:A143544
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| A143544 |
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Triangle read by rows, T(n,k) = 2 if n is prime, 1 otherwise; 1<=k<=n. |
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+0
2
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| 1, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = A143545: (1, 4, 6, 4, 10, 6, 14,...) = componentwise addition of (1, 2, 3, 4, 5,...) and A061397: (0, 2, 3, 0, 5, 0, 7,...).
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FORMULA
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Triangle read by rows, T(n,k) = 2 if n is prime, 1 otherwise; 1<=k<=n
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EXAMPLE
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First few rows of the triangle =
1;
2, 2;
2, 2, 2;
1, 1, 1, 1;
2, 2, 2, 2, 2;
1, 1, 1, 1, 1, 1;
2, 2, 2, 2, 2, 2, 2;
...
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CROSSREFS
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Cf. A061397, A143545.
Sequence in context: A016016 A063059 A102675 this_sequence A031346 A087472 A054348
Adjacent sequences: A143541 A143542 A143543 this_sequence A143545 A143546 A143547
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 23 2008
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