Smallest triangular number whose decimal expansion ends (nontrivially) with the n-th triangular number.
A229262
Smallest triangular number whose decimal expansion ends (nontrivially) with the n-th triangular number.
Terms
- a(0) =21a(1) =153a(2) =36a(3) =210a(4) =2415a(5) =3321a(6) =528a(7) =136a(8) =2145a(9) =3655a(10) =666a(11) =378a(12) =1891a(13) =6105a(14) =205120a(15) =185136a(16) =10153a(17) =399171a(18) =63190a(19) =78210a(20) =364231a(21) =5253a(22) =210276a(23) =180300a(24) =11325a(25) =406351a(26) =1378a(27) =81406a(28) =357435a(29) =4465
External references
- oeis: A229262