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Search: id:A087312
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| A087312 |
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a(1) = 1; for n > 1, a(n) is the smallest number == -1 (mod a(n-1)), greater than n, with the same prime signature as n. |
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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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a(9) does not exist because -1 is not a square mod 143055667. - David Wasserman (wasserma(AT)spawar.navy.mil), May 02 2005
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EXAMPLE
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a(6) = 33 has the prime signature of 6 and a(4) = 197 has the prime signature of 7 and 197 == -1 (mod 33).
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CROSSREFS
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Cf. A087311.
Sequence in context: A083318 A127904 A048578 this_sequence A099170 A018095 A003217
Adjacent sequences: A087309 A087310 A087311 this_sequence A087313 A087314 A087315
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KEYWORD
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fini,full,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 02 2003
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EXTENSIONS
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Corrected and extended by David Wasserman (wasserma(AT)spawar.navy.mil), May 02 2005
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