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Search: id:A069565
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| A069565 |
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a(0) = 1, a(n) = k*a(n-1) + 1 is a multiple of n-th prime. If no such number exists then a(n) =0 and a(n+1) = k*a(n-1) + 1 is a multiple of (n+1)-th prime; i.e. a(r) = smallest multiple of the r-th prime = k* a(s) + 1 where a(s) is the last nonzero term. |
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1
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| 1, 2, 3, 10, 21, 22, 221, 0, 2432, 9729, 19459, 136214, 1770783, 10624699, 446237359, 8478509822, 195005725907, 5655166051304, 90482656820865, 2171583763700761, 86863350548030441, 1216086907672426175
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OFFSET
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0,2
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EXAMPLE
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a(6) = 221 = 13*17. Hence there exists no number of the form k*221 + 1 which can be divisible by 17. hence a(7) = 0 and a(8) = 2432 = 11*221 + 1 is divisible by 19.
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CROSSREFS
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Cf. A069563, A069563, A069564.
Sequence in context: A089791 A141050 A079161 this_sequence A139694 A064497 A161522
Adjacent sequences: A069562 A069563 A069564 this_sequence A069566 A069567 A069568
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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), Mar 23 2002
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EXTENSIONS
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Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 27 2002
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