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 1,3.
A026438
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 1,3.
Terms
- a(0) =1a(1) =3a(2) =4a(3) =5a(4) =6a(5) =7a(6) =9a(7) =10a(8) =12a(9) =13a(10) =16a(11) =18a(12) =21a(13) =22a(14) =25a(15) =28a(16) =30a(17) =31a(18) =32a(19) =33a(20) =36a(21) =37a(22) =40a(23) =42a(24) =43a(25) =45a(26) =46a(27) =50a(28) =52a(29) =54
External references
- oeis: A026438