a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 7's.

A048543

a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 7's.

Terms

    a(0) =8a(1) =108a(2) =878a(3) =870a(4) =8813a(5) =27924a(6) =84129a(7) =882483a(8) =2788865a(9) =7601169a(10) =88190572a(11) =421518419a(12) =4204014483a(13) =26034169427a(14) =42305694389a(15) =88022598108a(16) =546605779129a(20) =88187696578a(21) =2516

External references