a(n) is the least number k such that both k and k + s have n prime divisors, counted with multiplicity, where s is the sum of the decimal digits of k.
A382996
a(n) is the least number k such that both k and k + s have n prime divisors, counted with multiplicity, where s is the sum of the decimal digits of k.
Terms
- a(0) =11a(1) =15a(2) =18a(3) =81a(4) =243a(5) =486a(6) =2976a(7) =25488a(8) =128768a(9) =396864a(10) =911232a(11) =8820864a(12) =69940224a(13) =118462464a(14) =1171768320a(15) =1756943946a(16) =11753349120a(17) =272313556992a(18) =491737042890
External references
- oeis: A382996