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Search: id:A136136
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| A136136 |
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a(n+1)=sopfr(2a(n)+1), with sopfr=A001414. Finishes with 10 (fixed point). |
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+0
6
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OFFSET
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1,2
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COMMENT
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The class of recurrence sequences a(n+1)=sopfr(C*a(n)+D) may finish with a fixed point or with a cycle.
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FORMULA
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a(n+1)=A001414(2*a(n)+1)
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MATHEMATICA
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sopfr = Function[x, Plus @@ Map[Times @@ # &, FactorInteger[x]]]; NestList[sopfr[2# + 1] &, 1, 10]
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CROSSREFS
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Cf. A001414.
Adjacent sequences: A136133 A136134 A136135 this_sequence A136137 A136138 A136139
Sequence in context: A076683 A045542 A031404 this_sequence A057548 A122227 A125570
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KEYWORD
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fini,nonn
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AUTHOR
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Carlos Alves (cjsalves(AT)gmail.com), Dec 16 2007
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