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URL: https://oeis.org/A110761

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A110761
a(0) = 1; a(n+1) = tau(N) where N is the concatenation of a(0), a(1), a(2), a(3), ..., a(n).
1
1, 1, 2, 10, 16, 32, 72, 32, 112, 20, 96, 20, 144, 80, 80, 640, 288, 288, 48, 80, 80, 480, 384, 384, 512, 160, 768, 88, 64, 24, 128, 112, 20, 24, 128, 336, 80, 80, 640, 576, 112, 2560, 576, 1792, 36, 192, 12, 48, 3072, 320, 1792, 576, 2688
OFFSET
0,3
EXAMPLE
a(0) = 1, a(1) = tau(1) = 1, a(2) = tau(11) = 2, a(3) = tau(112) = 10.
MAPLE
read("transforms") ;
A110761 := proc(n) option remember; local L ; if n = 0 then 1 ; else L := [seq(procname(i), i=0..n-1)] ; numtheory[tau]( digcatL(L)) ; end if; end proc: # R. J. Mathar, Apr 15 2011
MATHEMATICA
aggluTau[0] := 1; aggluTau[n_] := aggluTau[n] = DivisorSigma[0, FromDigits[Flatten[Table[IntegerDigits[aggluTau[i]], {i, 0, n - 1}]]]]; aggluTau/@Range[0, 19] (* Alonso del Arte, Jan 10 2020 *)
CROSSREFS
Cf. A000005 (tau).
Sequence in context: A341060 A189329 A242089 * A046036 A131474 A249153
KEYWORD
nonn,base,more
AUTHOR
Amarnath Murthy, Aug 11 2005
EXTENSIONS
a(22)-a(31) from Carl Najafi, Apr 15 2011
a(32)-a(49) from Chai Wah Wu, Dec 24 2019
a(50) from Chai Wah Wu, Jan 04 2020
a(51)-a(52) from Chai Wah Wu, Jan 08 2020
STATUS
approved