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A037102
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Trajectory of 3 under map n->9n+1 if n odd, n->n/2 if n even.
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0
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3, 28, 14, 7, 64, 32, 16, 8, 4, 2, 1, 10, 5, 46, 23, 208, 104, 52, 26, 13, 118, 59, 532, 266, 133, 1198, 599, 5392, 2696, 1348, 674, 337, 3034, 1517, 13654, 6827, 61444, 30722, 15361, 138250, 69125, 622126, 311063, 2799568, 1399784, 699892, 349946, 174973
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history;
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internal format)
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OFFSET
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0,1
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LINKS
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Table of n, a(n) for n=0..47.
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MATHEMATICA
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NestList[If[EvenQ[#], #/2, 9#+1]&, 3, 50] (* Harvey P. Dale, Sep 06 2022 *)
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PROG
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(Python)
from itertools import accumulate
def f(n, _): return 9*n+1 if n%2 == 1 else n//2
def aupton(terms): return list(accumulate([3]*terms, f))
print(aupton(48)) # Michael S. Branicky, Mar 28 2021
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CROSSREFS
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Sequence in context: A146072 A064234 A224579 * A042169 A041785 A157848
Adjacent sequences: A037099 A037100 A037101 * A037103 A037104 A037105
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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