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Search: id:A071776
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| A071776 |
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Related to Pisano periods: n such that the period of Fibonacci numbers mod n equals 3*(n+2). |
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+0
2
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| 6, 14, 26, 74, 86, 134, 146, 194, 206, 254, 314, 326, 386, 446, 554, 566, 626, 674, 734, 746, 794, 866, 914, 926, 974, 1046, 1094, 1154, 1214, 1226, 1286, 1346, 1454, 1466, 1514, 1574, 1646, 1706, 1754, 1766, 1814, 1874, 1994, 2066, 2126, 2186, 2234, 2246
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(n)/2 are primes with final digit 3 or 7 among primes in a related sequence: "m such that the period of Fibonacci numbers mod m equals 2*(m+1)".
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PROGRAM
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(PARI) for(n=2, 4000, t=3*(n+2); good=1; if(fibonacci(t)%n==0, for(s=0, t, if(fibonacci(t+s)%n!=fibonacci(s)%n, good=0; break); if(s>1&&s<t-1&&fibonacci(s)%n==0, cur=s; good2=1; for(ss=0, s, if(fibonacci(ss+s)%n!=fibonacci(ss)%n, good2=0; break)); if(good2, good=0; break); ); ); if(good, print1(n, ", ")))) (Klasen)
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CROSSREFS
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Cf. A071774, A001175.
Adjacent sequences: A071773 A071774 A071775 this_sequence A071777 A071778 A071779
Sequence in context: A131951 A093776 A107317 this_sequence A063590 A128806 A139596
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 04 2002
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EXTENSIONS
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More terms from Lambert Klasen (Lambert.Klasen(AT)gmx.net), Dec 21 2004
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