a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 9's.
A048547
a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 9's.
Terms
- a(0) =9a(1) =31a(2) =890a(3) =2234a(4) =14131a(5) =30331a(6) =173031a(7) =969520a(8) =9958890a(9) =31617890a(10) =360542549a(11) =547631234a(12) =3316547890a(13) =17318486343a(14) =114017542334a(15) =356363452109
External references
- oeis: A048547