Composite numbers k such that the digits of k are in nondecreasing order while the digits of the concatenation of k's ascending order prime factors, with repetition, are in nonincreasing order.
A372280
Composite numbers k such that the digits of k are in nondecreasing order while the digits of the concatenation of k's ascending order prime factors, with repetition, are in nonincreasing order.
Terms
- a(0) =4a(1) =8a(2) =9a(3) =16a(4) =22a(5) =25a(6) =27a(7) =33a(8) =44a(9) =49a(10) =55a(11) =77a(12) =88a(13) =99a(14) =125a(15) =128a(16) =155a(17) =256a(18) =279a(19) =1477a(20) =1555a(21) =1688a(22) =1899a(23) =2799a(24) =3479a(25) =3577a(26) =14777a(27) =16888a(28) =18999a(29) =22599
External references
- oeis: A372280