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A022439 a(n) = c(n-1) + c(n-3) where c is the sequence of numbers not in a. 1
2, 4, 5, 7, 11, 15, 18, 21, 23, 26, 29, 31, 35, 37, 41, 44, 47, 51, 53, 57, 60, 63, 66, 69, 72, 75, 78, 81, 83, 87, 89, 93, 95, 98, 101, 104, 107, 110, 113, 115, 119, 121, 125, 127, 131, 133 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
MATHEMATICA
Fold[Append[#1, Plus @@ Complement[Range[Max@#1 + 3], #1][[{#2, #2 + 2}]]] &, {2, 4, 5}, Range[43]] (* Ivan Neretin, Mar 30 2017 *)
CROSSREFS
Cf. A022424 and references therein.
Sequence in context: A097697 A035620 A363045 * A050134 A010065 A344654
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified May 29 18:36 EDT 2024. Contains 372952 sequences. (Running on oeis4.)