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A165495 First result not divisible by 4 when iterating k -> k+tau(k) from 2(2n-1)^2 2

%I

%S 7,38,71,122,178,265,415,486,602,799,927,1230,1321,1486,1810,1951,

%T 2214,2474,2830,3194,3386,3738,4206,4639,4874,5358,5838,6222,6534,

%U 7101,7482,8145,8570,9010,9722,10922,10922,11434,11882,12571,13274

%N First result not divisible by 4 when iterating k -> k+tau(k) from 2(2n-1)^2

%C This sequence and A165494 explore a critical aspect of the behavior of A064491.

%e For a(2) we start at 2.3^2=18; 18+tau(18)=24; 24+tau(24)=32; 32+tau(32)=38, which is not divisible by 4, so a(2)=38.

%Y Cf. A064491, A165494, A165496

%K easy,nonn

%O 1,1

%A _Hugo van der Sanden_, Sep 21 2009

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Last modified April 14 21:21 EDT 2021. Contains 342962 sequences. (Running on oeis4.)