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Search: id:A048593
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| A048593 |
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Converse numbers: composite Fibonacci numbers Fib(n) that are congruent to Legendre symbol (n/5) mod n. |
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| 4181, 75025, 1346269, 165580141, 956722026041, 1548008755920, 2504730781961, 308061521170129, 14472334024676221, 1779979416004714189, 573147844013817084101, 26925748508234281076009
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Lure of the Integers, Joe Roberts, "Integer 4181". (There is a misprint in the definition.)
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EXAMPLE
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4181 is the 19th Fibonacci number, it is composite and it is congruent to (19/5) mod 19.
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MAPLE
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with(combinat):with(numtheory): n := 1:while n<200 do n := n+1: if fibonacci(n) mod n = L(n, 5) then if not isprime(fibonacci(n)) then print(fibonacci(n)):fi:fi:od:
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CROSSREFS
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Cf. A000045.
Sequence in context: A091982 A072322 A045728 this_sequence A050937 A135953 A152511
Adjacent sequences: A048590 A048591 A048592 this_sequence A048594 A048595 A048596
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KEYWORD
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nonn
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AUTHOR
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Jud McCranie (j.mccranie(AT)comcast.net)
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