Numbers k such that sigma(k) = phi((prime(k)+prime(k+1))/2).
A068365
Numbers k such that sigma(k) = phi((prime(k)+prime(k+1))/2).
Terms
- a(0) =14a(1) =24a(2) =308a(3) =474a(4) =690a(5) =1242a(6) =2970a(7) =9690a(8) =10340a(9) =13110a(10) =18270a(11) =26400a(12) =161880
External references
- oeis: A068365