551775
domain: N
Appears in sequences
- Triangular numbers with only odd digits.at n=32A117960
- Triangular numbers composed of digits {1,5,7}.at n=7A119134
- Triangular numbers composed of only digits with line segments or both line segments and curves {1, 2, 4, 5, 7}.at n=38A247021
- G.f. A(x) satisfies A(x) = 1 + x^4*(1+x)^3*A(x)^4.at n=23A366595