Sum of primes in n-th shell of prime spiral.

Terms

a(0) =2a(1) =98a(2) =960a(3) =3828a(4) =10228a(5) =21772a(6) =40248a(7) =67390a(8) =105222a(9) =156300a(10) =221246a(11) =304392a(12) =404404a(13) =528100a(14) =672456a(15) =844334a(16) =1044690a(17) =1270896a(18) =1531834a(19) =1833912a(20) =2163068a(21) =2537074a(22) =2949726a(23) =3412394a(24) =3922832a(25) =4470566a(26) =5074544a(27) =5742778a(28) =6460670