Triangle T(i, j), 1 <= j <= i, read by rows. T(i, j) is the smallest number k that has i odd divisors and whose symmetric representation of sigma, SRS(k), has j parts; when no such k exists then T(i, j) = -1.
A384704
Triangle T(i, j), 1 <= j <= i, read by rows. T(i, j) is the smallest number k that has i odd divisors and whose symmetric representation of sigma, SRS(k), has j parts; when no such k exists then T(i, j) = -1.
Terms
- a(0) =1a(1) =6a(2) =3a(3) =18a(4) =-1a(5) =9a(6) =30a(7) =78a(8) =15a(9) =21a(10) =162a(11) =-1a(12) =-1a(13) =-1a(14) =81a(15) =90a(16) =666a(17) =45a(18) =75a(19) =63a(20) =147a(21) =1458a(22) =-1a(23) =-1a(24) =-1a(25) =-1a(26) =-1a(27) =729a(28) =210a(29) =1830
External references
- oeis: A384704