a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1 <= i <= j < n, n >= 2, with initial terms 1,4.
A026440
a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1 <= i <= j < n, n >= 2, with initial terms 1,4.
Terms
- a(0) =1a(1) =4a(2) =5a(3) =6a(4) =7a(5) =8a(6) =9a(7) =10a(8) =11a(9) =12a(10) =13a(11) =14a(12) =16a(13) =17a(14) =18a(15) =20a(16) =21a(17) =22a(18) =25a(19) =26a(20) =28a(21) =30a(22) =32a(23) =33a(24) =36a(25) =37a(26) =38a(27) =40a(28) =42a(29) =45
External references
- oeis: A026440