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Search: id:A073690
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| A073690 |
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Group the natural numbers so that the product of the terms in each group + 1 is a prime: (1), (2), (3, 4), (5, 6), (7, 8, 9, 10, 11), (12), (13, 14, 15), (16), ... This is the sequence of the number of terms in each group. |
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+0
3
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| 1, 1, 2, 2, 5, 1, 3, 1, 2, 5, 2, 6, 7, 5, 3, 9, 3, 2, 3, 5, 2, 2, 5, 1, 6, 10, 13, 1, 11, 8, 3, 2, 3, 1, 7, 7, 18, 43, 7, 6, 7, 1, 27, 16, 1, 7, 6, 2, 1, 2, 16, 6, 9, 3, 2, 24, 3, 1, 6, 8, 6, 8, 6, 19, 6, 1, 12, 5, 7, 13, 1, 7, 3, 7, 6, 6, 1, 7, 20, 20, 20, 2, 1, 5, 1, 10, 3, 1, 7, 2, 1, 13, 1, 9, 9
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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4 cannot be a member. Do all other positive integers occur?
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CROSSREFS
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Cf. A073688, A073689.
Sequence in context: A011342 A084046 A016586 this_sequence A079301 A079300 A128932
Adjacent sequences: A073687 A073688 A073689 this_sequence A073691 A073692 A073693
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 12 2002
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EXTENSIONS
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More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 24 2003 and Dean Hickerson (dean(AT)math.ucdavis.edu), Apr 27 2003
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