500000500000
domain: N
Appears in sequences
- Smallest triangular number containing exactly n 0's.at n=9A036517
- a(n) = 10^n*(10^n+1)/2.at n=6A037156
- Triangular numbers containing 2n digits obtained by duplicating the first n digits; i.e., triangular numbers in A020338.at n=21A068899
- a(n) = (n^12 + n^6)/2.at n=10A071235
- Triangular numbers composed of digits {0,2,5}.at n=10A119051
- Triangular numbers composed of digits {0,3,5}.at n=9A119061
- Triangular numbers composed of digits {0,4,5}.at n=17A119071
- Triangular numbers composed of digits {0,5,6}.at n=16A119079
- Triangular numbers composed of digits {0,5,7}.at n=7A119081
- Triangular numbers composed of digits {0,5,8}.at n=5A119083
- Triangular numbers composed of digits {0,5,9}.at n=11A119085
- Triangular numbers whose nonzero digits are all the same.at n=18A352057