a(1) = 1, a(n) = sum of n successive primes beginning with n if n is prime otherwise a(n) = sum of n successive composite numbers beginning with n.
A110343
a(1) = 1, a(n) = sum of n successive primes beginning with n if n is prime otherwise a(n) = sum of n successive composite numbers beginning with n.
Terms
- a(0) =1a(1) =5a(2) =15a(3) =27a(4) =53a(5) =59a(6) =119a(7) =102a(8) =135a(9) =172a(10) =311a(11) =240a(12) =473a(13) =318a(14) =371a(15) =427a(16) =833a(17) =528a(18) =1103a(19) =641a(20) =715a(21) =793a(22) =1643a(23) =928a(24) =1015a(25) =1105a(26) =1201a(27) =1301a(28) =2647a(29) =1472
External references
- oeis: A110343