a(n) is the least positive number k that can be written in exactly k ways as (x*y+1)*(x*z+1) with x > y > z > 1.
A345215
a(n) is the least positive number k that can be written in exactly k ways as (x*y+1)*(x*z+1) with x > y > z > 1.
Terms
- a(0) =1a(1) =28a(2) =176a(3) =561a(4) =2701a(5) =7381a(6) =29161a(7) =51681a(8) =115921a(9) =390241a(10) =260281a(11) =924001a(12) =1334161a(13) =1413721a(14) =1038961a(15) =3178981a(16) =8826301a(17) =3000025a(18) =16597441a(19) =33882241a(20) =12708361a(21) =22589281a(22) =31375081a(23) =63095761a(24) =90336961
External references
- oeis: A345215