a(1) = 8, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).
A063403
a(1) = 8, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).
Terms
- a(0) =8a(1) =24a(2) =46a(3) =223a(4) =1223a(5) =11223a(6) =87129a(7) =189461a(8) =414621a(9) =2072003a(10) =12072003a(11) =34024001a(12) =163920759a(13) =354640253a(14) =1074732999a(15) =7377145687a(16) =17377145687a(17) =57053304579a(18) =393145173803a(19) =834736688841
External references
- oeis: A063403