a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 4's.
A048537
a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 4's.
Terms
- a(0) =6a(1) =66a(2) =215a(3) =681a(4) =6681a(5) =12018a(6) =201115a(7) =1531159a(8) =6541784a(9) =21058215a(10) =156340764a(11) =675098840a(12) =5868938806a(13) =6666461193a(14) =120186956049a(15) =586862372693
External references
- oeis: A048537