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A048531

a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 1's.

3, 10, 105, 1010, 10203, 33928, 105551, 335128, 1054130, 12313046, 100573943, 333192303, 1054092885, 4261585525, 30184681729, 133083117303, 331829837885, 4136557897710, 11666683809854, 105410706823885, 333183899837885, 3333333637837885, 6466156610468989, 33928029520312720, 138242940872632303

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

Eric Weisstein's World of Mathematics, Pronic Number

EXAMPLE

From Jesse Sealand, Oct 06 2019: (Start)

a(1) = 3 since A002378(3) = 12;

a(2) = 10 since A002378(10) = 110;

a(3) = 105 since A002378(105) = 11130;

a(4) = 1010 since A002378(1010) = 1021110, etc.