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A133058
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a(n)=a(n-1)/gcd(n,a(n-1)) if gcd(n,a(n-1)) divides a(n-1), else a(n)=a(n-1)+n+1 (gcd denotes greatest common divisor).
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1
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1, 1, 4, 8, 2, 8, 4, 12, 3, 1, 12, 24, 2, 16, 8, 24, 3, 21, 7, 27, 48, 16, 8, 32, 4, 30, 15, 5, 34, 64, 32, 64, 2, 36, 18, 54, 3, 41, 80, 120, 3, 45, 15, 59, 104, 150, 75, 123, 41, 91, 142, 194, 97, 151, 206, 262, 131, 189, 248, 308, 77, 139, 202, 266, 133, 199, 266, 334, 167
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| For every integer a(0) we have a(2*r+4*t+0)=1, a(2*r+4*t+1)=2*r+4*t+3, a(2*r+4*t+2)=2*(2*r+4*t+3), a(2*r+4*t+3)=2 for some integers r and t>=0. - Ctibor O. Zizka (ctibor.zizka(AT)seznam.cz), Dec 26 2007
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CROSSREFS
| Cf. A133579.
Sequence in context: A143530 A090488 A020848 * A011516 A088609 A163813
Adjacent sequences: A133055 A133056 A133057 * A133059 A133060 A133061
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KEYWORD
| nonn
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AUTHOR
| Ctibor O. ZIZKA (ctibor.zizka(AT)seznam.cz), Dec 16 2007
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EXTENSIONS
| More terms from Ctibor O. Zizka (ctibor.zizka(AT)seznam.cz), Dec 26 2007
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