A119844 Records in A119842.

1, 2, 6, 14, 22, 252, 17526, 9278038, 23694308, 1186593143406, 789632365568454684, 3199548374111958458274, 849440501364681630324594977448

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Mathematica

b[s_, t_] := b[s, t] = If[Length[s] < 1, 1, Sum[If[Mod[PrimeOmega[x], 2] == 1 - t && Length[Select[s, Mod[#, x] == 0 &]] == 1, b[s~Complement~{x}, 1 - t], 0], {x, s}]]; a[n_] := a[n] = Module[{l, m}, l = Sort[ FactorInteger[n], #1[[2]] > #2[[2]] &]; m = Product[Prime[i]^l[[i]][[2]], {i, 1, Length[l]}]; b[Divisors[m][[2 ;; -2]], Mod[PrimeOmega[m], 2]]]; Reap[For[record = 0; k = 1, k < 10^4, k++, If[a[k] > record, record = a[k]; Print[k, " ", a[k]]; Sow[a[k]]]]][[2, 1]] (* Jean-François Alcover, Mar 03 2016, after Alois P. Heinz *)

Crossrefs

a(n) = A119842(A119843(n)).

Sequence in context: A074729 A099901 A119846 * A016060 A307643 A239877

Adjacent sequences: A119841 A119842 A119843 * A119845 A119846 A119847

Keyword

nonn

Author

Antti Karttunen, Jun 04 2006

Extensions

a(9)-a(13) from Alois P. Heinz, Feb 26 2016

Status

approved