Composite numbers k such that k's prime factors are distinct, the digits of k are in nonincreasing order while the digits of the concatenation of k's ascending order prime factors are in nondecreasing order.
A372295
Composite numbers k such that k's prime factors are distinct, the digits of k are in nonincreasing order while the digits of the concatenation of k's ascending order prime factors are in nondecreasing order.
Terms
- a(0) =6a(1) =10a(2) =21a(3) =30a(4) =42a(5) =70a(6) =74a(7) =94a(8) =111a(9) =210a(10) =222a(11) =553a(12) =554a(13) =611a(14) =851a(15) =871a(16) =885a(17) =998a(18) =5530a(19) =5554a(20) =7751a(21) =8441a(22) =8655a(23) =9998a(24) =85511a(25) =95554a(26) =99998a(27) =9999998a(28) =77744411a(29) =5555555554
External references
- oeis: A372295