a(n) is the index of the smallest triangular number containing exactly n 0's.
A048355
a(n) is the index of the smallest triangular number containing exactly n 0's.
Terms
- a(0) =0a(1) =24a(2) =200a(3) =775a(4) =2000a(5) =10000a(6) =20000a(7) =100000a(8) =200000a(9) =1000000a(10) =2000000a(11) =10000000a(12) =20000000a(13) =100000000a(14) =200000000a(15) =1000000000a(16) =2000000000a(17) =10000000000a(18) =20000000000a(19) =100000000000a(20) =200000000000a(21) =1000000000000
External references
- oeis: A048355