Members of a pair (m,n) such that sigma(m) = sigma(n) = sigma(n-m), m < n where sigma = A000203.

Terms

a(0) =1288a(1) =2773a(2) =1485a(3) =2773a(4) =5775a(5) =11903a(6) =6128a(7) =11903a(8) =8008a(9) =19693a(10) =11685a(11) =19693a(12) =16744a(13) =36049a(14) =19305a(15) =36049a(16) =21896a(17) =47141a(18) =25245a(19) =47141a(20) =24472a(21) =52687a(22) =28215a(23) =52687a(24) =26488a(25) =61993a(26) =35505a(27) =61993a(28) =32620a(29) =78061