Numbers k such that the quotient (sigma(k) + sigma(k+1))/sigma(2*k+1) is smaller than 1/2.
A091291
Numbers k such that the quotient (sigma(k) + sigma(k+1))/sigma(2*k+1) is smaller than 1/2.
Terms
- a(0) =1283782a(1) =3445942a(2) =4662157a(3) =5743237a(4) =7770262a(5) =8806297a(6) =8986477a(7) =9572062a(8) =9920137a(9) =10472962a(10) =11356537a(11) =11554042a(12) =12635122a(13) =12870742a(14) =14932417a(15) =14977462a(16) =15833317a(17) =15878362a(18) =17995477a(19) =18761242a(20) =19256737a(21) =20202682a(22) =21058537a(23) =21824302a(24) =22860337a(25) =23709262a(26) =24121597
External references
- oeis: A091291