[seqfan] Re: A104149 More terms

Richard Mathar mathar at strw.leidenuniv.nl
Thu Aug 19 16:36:32 CEST 2010


http://list.seqfan.eu/pipermail/seqfan/2010-August/005718.html

This is easy with a little bit of cheating:

%I A104149
%S A104149 1,2,22,1966,3262,5014,60454,1016506,4420162,12055510,14365606,25726726,
%T A104149 27896422,66562306,72764734,98734966,175186654,224868310,253694926,288657202,
%U A104149 386668342,421575406,504737746,630645454
%N A104149 Numbers n such that sigma(n+2) = sigma(n+1) + sigma(n).
%F A104149 a(n) = A065900(n)-2 . [R. J. Mathar, Aug 19 2010]
%e A104149 sigma(22) = 1+2+11+22 = 36
%e A104149 sigma(23) = 1+23 = 24
%e A104149 sigma(24) = 1+2+3+4+6+8+12+24 = 60
%e A104149 sigma(24)  = sigma(23) + sigma(22)
%K A104149 more,nonn,new
%O A104149 1,2
%A A104149 Neven Juric (neven.juric(AT)apis-it.hr), Aug 16, 2010
%E A104149 More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 19 2010






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