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A353957
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a(n) = (85*4^n - 1)/3.
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0
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113, 453, 1813, 7253, 29013, 116053, 464213, 1856853, 7427413, 29709653, 118838613, 475354453, 1901417813, 7605671253, 30422685013, 121690740053, 486762960213, 1947051840853, 7788207363413, 31152829453653, 124611317814613, 498445271258453, 1993781085033813
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OFFSET
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1,1
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COMMENTS
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When any term in the sequence is iterated using the Collatz function, its trajectory's only odd number before reaching 1 will be 85.
Also, each term would have 2n+10 steps as its stopping time (A006577).
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LINKS
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EXAMPLE
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When n=5, a(5) = 29013 and when iterated using the Collatz function will have the following trajectory: 87040,43520,21760,10880,5440,2720,1360,680,340,170,85,256,128,64,32,16,8,4,2,1
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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