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 A122398 Sequence is inverse permutation to A122397. 2
 1, 2, 3, 4, 8, 5, 11, 7, 12, 6, 18, 14, 21, 9, 10, 17, 32, 15, 35, 28, 13, 16, 40, 22, 27, 19, 24, 31, 49, 25, 56, 45, 20, 30, 29, 36, 68, 33, 23, 41, 73, 26, 82, 48, 39, 38, 83, 44, 55, 46, 34, 61, 97, 43, 50, 57, 37, 47, 105, 52, 116, 54, 53, 64, 63, 59, 123, 69, 42, 62, 132 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Sequence is probably a permutation of the positive integers. LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE A[1]:= 1: A[2]:= 2: A[3]:= 3: B[1]:=1: B[2]:= 2: B[3]:= 3: S:= {\$4..300}: for n from 4 do P:= numtheory:-factorset(A[n-2]); for s in S do if member(igcd(s, A[n-2]), P) then A[n]:= s; B[s]:= n; S:= S minus {s}; break fi od; if not assigned(A[n]) then break fi; od: seq(B[i], i=1..S[1]-1); # Robert Israel, Jan 04 2023 CROSSREFS Cf. A122397. Sequence in context: A137623 A358875 A191541 * A329567 A326487 A253562 Adjacent sequences: A122395 A122396 A122397 * A122399 A122400 A122401 KEYWORD nonn AUTHOR Leroy Quet, Aug 31 2006 EXTENSIONS Extended by Ray Chandler, Sep 05 2006 STATUS approved

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Last modified May 29 15:14 EDT 2023. Contains 363042 sequences. (Running on oeis4.)