Triangular numbers composed of digits {1,2,4}.
A119099
Triangular numbers composed of digits {1,2,4}.
Terms
- a(0) =1a(1) =21a(2) =2211a(3) =222111a(4) =1422141a(5) =4244241a(6) =22221111a(7) =44241121a(8) =124212441a(9) =2222211111a(10) =222222111111
External references
- oeis: A119099