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Search: id:A096100
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| A096100 |
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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
3
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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(4) is not 2 since 2*2*2+1 = 9 is composite, but 2*3+1 = 7, 2*2*3+1 = 13, 1*2*2*3+1 = 13 are all prime, hence a(4) = 3.
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CROSSREFS
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Sequence in context: A166678 A032908 A060631 this_sequence A021451 A134232 A123934
Adjacent sequences: A096097 A096098 A096099 this_sequence A096101 A096102 A096103
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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, corrected 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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