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A071419
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a(1)=1, a(n+1)=(a(n)+n)/2 if a(n)+n is even, a(n+1)=(3*(a(n)+n)+1)/2 otherwise.
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0
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1, 1, 5, 4, 4, 14, 10, 26, 17, 13, 35, 23, 53, 33, 71, 43, 89, 53, 107, 63, 125, 73, 143, 83, 161, 93, 179, 103, 197, 113, 215, 123, 233, 133, 251, 143, 269, 153, 287, 163, 305, 173, 323, 183, 341, 193, 359, 203, 377, 213, 395, 223, 413, 233, 431, 243, 449, 253
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Let a(1) be any integer >=0, is there always a positive integer N such that if n>=N a(n+2)-a(n)= 10 or 18 (depending on the parity of n)?
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FORMULA
| For k>=1 a(2k+12)=13+10k, a(2k+11)=17+18k
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CROSSREFS
| Sequence in context: A134206 A134209 A019842 * A019117 A204372 A123587
Adjacent sequences: A071416 A071417 A071418 * A071420 A071421 A071422
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KEYWORD
| easy,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), May 29 2002
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