A114599 - OEIS

A114599

a(1)=a(2)=1. For n >= 3, a(n) = 1 + (A114600(n-2))*(A114600(n-1)).

1, 1, 2, 3, 7, 22, 78, 144, 40, 16, 11, 23, 254, 2922, 61850, 602420, 409448, 42038, 2669414, 38065410, 255320214, 315752716934, 22408767609924, 18684193273697426172, 85136306795697966858, 4400725717987783759574480

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OFFSET

1,3

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

13 is the greatest prime dividing a(7) = 78 and 3 is the greatest prime dividing a(8) = 144. So a(9) = 1 + 13*3 = 40.

MATHEMATICA

f[n_] := If[n == 1, 1, FactorInteger[n][[ -1, 1 ]]]; g[l_] := Append[l, 1 + Times @@ f /@ Take[l, -2]]; Nest[g, {1, 1}, 30] (* Ray Chandler, Dec 26 2005 *)

CROSSREFS

Cf. A006530, A114600.

Sequence in context: A187014 A053966 A010738 * A094062 A038159 A077210

Adjacent sequences: A114596 A114597 A114598 * A114600 A114601 A114602

KEYWORD

nonn

AUTHOR

Leroy Quet, Dec 13 2005

EXTENSIONS

Extended by Ray Chandler, Dec 26 2005

STATUS

approved