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1, 3, 4, 7, 10, 10, 11, 15, 18, 18, 22, 23, 25, 25, 26, 31, 34, 34, 38, 39, 41, 41, 46, 47, 49, 50, 54, 54, 56, 56, 57, 63, 66, 66, 70, 71, 73, 73, 78, 79, 81, 82, 86, 86, 88, 88, 94, 95, 97, 98, 102, 102, 104, 105, 110, 110, 113, 116, 117, 117, 119, 119, 120, 127, 130, 130, 134, 135, 137, 137, 142, 143, 145, 146
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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The sequence gives the parent node of each leaf-vertex (A055938) in binary beanstalk.
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LINKS
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FORMULA
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EXAMPLE
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Terms of A055938 are the leaf-nodes in Paul Tek's illustration. This sequence gives the corresponding parent-node (in that illustration a node immediately below where the arrow points), for each term of A055938[1..]: 2, 5, 6, 9, 12, 13, 14, ...
As A055938(4) = 9, and 9's parent node is 7 (because A011371(9) = 7), a(4) = 7.
As A055938(5) = 12, and 12's parent node is 10, a(5) = 10.
As A055938(6) = 13, and 13's parent node is 10, a(6) = 10.
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PROG
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CROSSREFS
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Cf. A257508 (same sequence with duplicates removed), A257512 (the terms which occur twice).
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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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