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A075639
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a(1) = 1 and then group the prime numbers so that the n-th group contains n numbers with a composite sum: (1), (2, 7), (3, 5, 13), (11, 17, 19, 23), (29, 31, 37, 41, 47), (43, 53, 59, 61, 67, 71), ...
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3
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1, 2, 7, 3, 5, 13, 11, 17, 19, 23, 29, 31, 37, 41, 47, 43, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..60.
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EXAMPLE
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1; 2,7; 3,5,13; 11,17,19,23; 29,31,37,41,47; 43,53,59,61,67,71; ...
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CROSSREFS
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Cf. A075640, A075641, A075642.
Sequence in context: A088538 A210516 A011049 * A082737 A104957 A083119
Adjacent sequences: A075636 A075637 A075638 * A075640 A075641 A075642
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KEYWORD
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nonn,tabl
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 30 2002
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EXTENSIONS
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More terms from David Wasserman, Jan 22 2005
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STATUS
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approved
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