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Search: id:A096101
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| A096101 |
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a(1) = 1; for n > 1: a(n) = smallest number >1 such that product of any two or more successive terms - 1 is prime. |
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+0
2
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OFFSET
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1,2
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COMMENT
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Next term > 20000000 if it exists.
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EXAMPLE
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a(2) is not 2 since 1*2-1 = 1 is not prime, but 1*3-1 = 2 is prime, hence a(2) = 3. a(6) is not 2 since 2*2*2*2-1 = 15 is not prime, but 2*3-1 = 5, 2*2*3-1 = 11, 2*2*2*3-1 = 23, 3*2*2*2*3-1 = 71 are all prime, hence a(6) = 3.
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CROSSREFS
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Cf. A096100.
Sequence in context: A141070 A163751 A067279 this_sequence A104890 A064123 A024703
Adjacent sequences: A096098 A096099 A096100 this_sequence A096102 A096103 A096104
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KEYWORD
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more,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 24 2004
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EXTENSIONS
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Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jul 05 2004
a(10) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Apr 22 2008
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