Triangle read by rows: T(n, k) is the smallest x such that the denominator of sigma(x)/x is equal to n and the numerator of sigma(x)/x is congruent to k modulo n.
A242370
Triangle read by rows: T(n, k) is the smallest x such that the denominator of sigma(x)/x is equal to n and the numerator of sigma(x)/x is congruent to k modulo n.
Terms
- a(0) =2a(1) =3a(2) =84a(3) =40a(4) =2a(5) =4a(6) =5a(7) =30a(8) =15a(9) =10a(10) =18a(11) =3a(12) =2a(13) =84a(14) =1907020800a(15) =7a(16) =42a(17) =840a(18) =280a(19) =14a(20) =168a(21) =58752a(22) =40a(23) =32640a(24) =2a(25) =96a(26) =4a(27) =8a(28) =540a(29) =54
External references
- oeis: A242370