a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 5's.
A048539
a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 5's.
Terms
- a(0) =7a(1) =23a(2) =74a(3) =2248a(4) =2292a(5) =23506a(6) =50552a(7) =742667a(8) =2357022a(9) =22706949a(10) =74555050a(11) =703955648a(12) =745020507a(13) =3996943276a(14) =74333434976a(15) =244040827632a(16) =505525029504
External references
- oeis: A048539