Numbers k such that 10^k - sigma(k^2) is prime.

A193881

Numbers k such that 10^k - sigma(k^2) is prime.

Terms

    a(0) =7a(1) =52a(2) =446a(3) =614a(4) =1137a(5) =4852a(6) =5615a(7) =22154a(8) =71291

External references