Search: id:A046181 Results 1-1 of 1 results found. %I A046181 %S A046181 1,3,63,261,6141,25543,601723,2502921,58962681,245260683,5777740983, %T A046181 24033043981,566159653621,2354993049423,55477868313843,230765285799441, %U A046181 5436264935102961,22612643015295763 %N A046181 Indices of octagonal numbers which are also triangular. %H A046181 Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics. %F A046181 For n odd, a(n+2)=98*a(n+1)-a(n)-32; for n even, a(n+1)=49*a(n)-16+10*(24*a(n)^2-16*a(n)+1)^0.5 - Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 03 2007, Oct 09 2007 %Y A046181 Cf. A046182, A046183. %Y A046181 Cf. A046182 A046183. %Y A046181 Sequence in context: A087886 A123754 A048354 this_sequence A151993 A120053 A139293 %Y A046181 Adjacent sequences: A046178 A046179 A046180 this_sequence A046182 A046183 A046184 %K A046181 nonn %O A046181 1,2 %A A046181 Eric Weisstein (eric(AT)weisstein.com) %E A046181 More terms from Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 03 2007 Search completed in 0.001 seconds