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Search: id:A081727
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| A081727 |
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Length of periods of Euler numbers modulo n. |
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+0
2
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| 1, 1, 2, 1, 2, 2, 6, 4, 6, 2, 10, 2, 6, 6, 2, 8, 8, 6, 18, 2, 6, 10, 22, 4, 10, 6, 18, 6, 14, 2, 30, 16, 10, 8, 6, 6, 18, 18, 6, 4
(list; graph; listen)
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OFFSET
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1,3
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FORMULA
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a(n)=n-1 if n=2, 3, 7, 11, 19, 23, 31...is a prime == 2 or 3 (mod 4) (A045326)
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EXAMPLE
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A000364 modulo 5 gives : 1,1,0,1,0,1,0,1,0,1,0,... with period (1,0) of length 2, hence a(5)=2.
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CROSSREFS
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Cf. A000364, A045326.
Sequence in context: A093659 A067541 A054706 this_sequence A000020 A077014 A093655
Adjacent sequences: A081724 A081725 A081726 this_sequence A081728 A081729 A081730
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KEYWORD
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more,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 06 2003
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