login
(0=0, 1=1, 2=2, 3=3, 4=2^2, 5=5, 6=2*3, 7=7, 8=2^3, 9=3^2, 10=2*5, 11=11, 12=2^2*3, ..) becomes (0*0+1, 1*2+2, 3*3+4, 2*2+5, 5*6+2, 3*7+7, 8*2+3, 9*3+2, 10*2+5, 11*11+12, 2*2+3, ..).
0

%I #4 Mar 30 2012 18:52:27

%S 1,4,13,9,32,28,19,29,25,133,7,183,29,31,25,308,25,382,31,43,45,554,

%T 34,36,53,37,11,871,11,993,43,67,69,71,7,111,95,130,83,246,87,344,90,

%U 498,56,93,2258,61,64,12,170,106,742,111,170,618,78,115,117,3542,11,3783

%N (0=0, 1=1, 2=2, 3=3, 4=2^2, 5=5, 6=2*3, 7=7, 8=2^3, 9=3^2, 10=2*5, 11=11, 12=2^2*3, ..) becomes (0*0+1, 1*2+2, 3*3+4, 2*2+5, 5*6+2, 3*7+7, 8*2+3, 9*3+2, 10*2+5, 11*11+12, 2*2+3, ..).

%e 13*13+14=183=a(12).

%e 2*7+15=29=a(13).

%e 3*5+16=31=a(14).

%e 2*4+17=25=a(15).

%e 17*18+2=308=a(16).

%e 3*2+19=25=a(17).

%e 19*20+2=382=a(18).

%e 2*5+21=31=a(19),

%e etc.

%Y Cf. A002808.

%K nonn

%O 1,2

%A _Juri-Stepan Gerasimov_, Dec 01 2008

%E Corrected (39 replaced by 43, 75 by 95, 71 by 130) by _R. J. Mathar_, May 01 2010