a(n) is the minimum positive integer j such that [j, j+n-1] does not contain any values of sigma(k) (i.e., sum of all positive divisors of k).
A109322
a(n) is the minimum positive integer j such that [j, j+n-1] does not contain any values of sigma(k) (i.e., sum of all positive divisors of k).
Terms
- a(0) =2a(1) =9a(2) =9a(3) =49a(4) =49a(5) =423a(6) =423a(7) =423a(8) =423a(9) =1333a(10) =1333a(11) =4425a(12) =4425a(13) =4425a(14) =4425a(15) =8763a(16) =8763a(17) =14089a(18) =14089a(19) =22825a(20) =22825a(21) =22825a(22) =22825a(23) =40291a(24) =40291a(25) =40291a(26) =40291a(27) =40291a(28) =40291a(29) =178705
External references
- oeis: A109322