a(n) is the index of the smallest triangular number containing exactly n 6's.
A048361
a(n) is the index of the smallest triangular number containing exactly n 6's.
Terms
- a(0) =3a(1) =11a(2) =36a(3) =363a(4) =3366a(5) =8563a(6) =35963a(7) =394123a(8) =3055048a(9) =11531588a(10) =115464831a(11) =115470036a(12) =1154484036a(13) =10645763163a(14) =35401884036a(15) =152754484036a(16) =365148371588
External references
- oeis: A048361