a(n) is the smallest number which can be represented as the sum of 4 distinct nonzero tetrahedral numbers in exactly n ways, or -1 if no such number exists.
A374809
a(n) is the smallest number which can be represented as the sum of 4 distinct nonzero tetrahedral numbers in exactly n ways, or -1 if no such number exists.
Terms
- a(0) =35a(1) =115a(2) =260a(3) =315a(4) =760a(5) =705a(6) =1310a(7) =1824a(8) =2365a(9) =1915a(10) =2475a(11) =3335a(12) =6240a(13) =4645a(14) =7735a(15) =8455a(16) =12120a(17) =11505a(18) =15440a(19) =13026a(20) =17325a(21) =20020a(22) =24125a(23) =25575a(24) =26400a(25) =32935a(26) =34440a(27) =36575a(28) =40040a(29) =37180
External references
- oeis: A374809