a(n) = least k such that 1+2+...+k >= E{1,2,...,n}, where E is the 3rd elementary symmetric function.
A027917
a(n) = least k such that 1+2+...+k >= E{1,2,...,n}, where E is the 3rd elementary symmetric function.
Terms
- a(0) =3a(1) =10a(2) =21a(3) =38a(4) =63a(5) =95a(6) =137a(7) =191a(8) =256a(9) =334a(10) =427a(11) =535a(12) =661a(13) =805a(14) =968a(15) =1151a(16) =1357a(17) =1585a(18) =1838a(19) =2117a(20) =2422a(21) =2755a(22) =3117a(23) =3510a(24) =3934a(25) =4392a(26) =4883a(27) =5409a(28) =5973a(29) =6574
External references
- oeis: A027917