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A372443
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The n-th iterate of 27 with Reduced Collatz-function R, which gives the odd part of 3n+1.
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15
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27, 41, 31, 47, 71, 107, 161, 121, 91, 137, 103, 155, 233, 175, 263, 395, 593, 445, 167, 251, 377, 283, 425, 319, 479, 719, 1079, 1619, 2429, 911, 1367, 2051, 3077, 577, 433, 325, 61, 23, 35, 53, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
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OFFSET
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0,1
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LINKS
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FORMULA
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a(0) = 27; for n > 0, a(n) = R(a(n-1)), where R(n) = (3*n+1)/2^A371093(n) = A000265(3*n+1).
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PROG
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(PARI)
R(n) = { n = 1+3*n; n>>valuation(n, 2); };
A372443(n) = { my(x=27); while(n, x=R(x); n--); (x); };
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CROSSREFS
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From term 47 to the first 1 same as A088593.
Sequences derived from this one or related to:
A372362 the 2-adic valuation of 1 + 3*a(n), equal to row index of a(n) in array A257852,
A372446 a(n) xored with the term of A086893 having the same binary length,
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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