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Search: id:A121568
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| A121568 |
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Fibonacci[ (p - 1)/2 ], where p = Prime[n]. |
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+0
4
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| 1, 1, 2, 5, 8, 21, 34, 89, 377, 610, 2584, 6765, 10946, 28657, 121393, 514229, 832040, 3524578, 9227465, 14930352, 63245986, 165580141, 701408733, 4807526976, 12586269025, 20365011074, 53316291173, 86267571272, 225851433717
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OFFSET
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2,3
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COMMENT
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p = Prime[n] divides a(n) = Fibonacci[(p-1)/2] for p = {29,41,61,89,101,109,149,181,229,241,269,281,349,381,...} = A033205[n] Primes of form x^2+5*y^2 excluding A033205[1] = 5.
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FORMULA
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a(n) = Fibonacci[ (Prime[n]-1)/2 ], n>1.
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MATHEMATICA
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Table[Fibonacci[(Prime[n]-1)/2], {n, 2, 50}]
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CROSSREFS
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Cf. A000045, A121567, A033205, A045468, A064739.
Sequence in context: A092446 A087077 A117647 this_sequence A001005 A009735 A137095
Adjacent sequences: A121565 A121566 A121567 this_sequence A121569 A121570 A121571
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 07 2006
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