a(n) is the smallest number not already used such that a(n)*a(n-1)*a(n-2) + 1 is a square, with a(1)=1 and a(2)=2.
A064691
a(n) is the smallest number not already used such that a(n)*a(n-1)*a(n-2) + 1 is a square, with a(1)=1 and a(2)=2.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =3a(4) =10a(5) =12a(6) =7a(7) =20a(8) =6a(9) =8a(10) =11a(11) =5a(12) =21a(13) =16a(14) =9a(15) =35a(16) =13a(17) =72a(18) =58a(19) =65a(20) =604a(21) =1570a(22) =483a(23) =7868a(24) =43510a(25) =408a(26) =1092a(27) =659a(28) =2030a(29) =14316
External references
- oeis: A064691