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A101504 a(n+1)=a(n)/x+x, with x = Max(a(k): 0<=k<n and a(k)|a(n)), a(0)=a(1)=1. 2
1, 1, 2, 3, 4, 4, 5, 6, 5, 6, 7, 8, 6, 7, 8, 9, 6, 7, 8, 9, 10, 7, 8, 9, 10, 11, 12, 8, 9, 10, 11, 12, 13, 14, 9, 10, 11, 12, 13, 14, 15, 8, 9, 10, 11, 12, 13, 14, 15, 16, 10, 11, 12, 13, 14, 15, 16, 17, 18, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
a(n)>a(n+1) iff a(n) is composite and a(n)>Max(a(k):0<=k<n);
a(A101505(n)) = n and a(m) < n for m < A101505(n).
LINKS
MATHEMATICA
Nest[Append[#, (x = Max@Intersection[Most@#, Divisors[#[[-1]]]]) + #[[-1]]/x] &, {1, 1}, 77] (* Ivan Neretin, Aug 24 2016 *)
CROSSREFS
Sequence in context: A092032 A058222 A064064 * A125568 A248110 A108872
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Dec 05 2004
STATUS
approved

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Last modified June 21 11:05 EDT 2024. Contains 373544 sequences. (Running on oeis4.)