A134682 Smallest number such that in base 10 the concatenation of its divisors has n digits.

1, 2, 4, 6, 10, 16, 12, 20, 44, 24, 30, 36, 102, 48, 80, 112, 72, 60, 108, 132, 200, 220, 192, 144, 320, 120, 216, 210, 312, 180, 252, 690, 300, 468, 240, 336, 432, 528, 576, 816, 1104, 1040, 360, 504, 420, 540, 600, 660, 1056, 1020, 1380, 1296, 2052, 900

Offset: 1

Author

Reinhard Zumkeller, Nov 06 2007

Keywords

• nonn
• base

Comments

a(n) = Min{m: A134681(m) = n}.

Crossrefs

Cf. A037278, A055642, A134681, A027750.

Programs

PARI

a(n) = my(k=1); while (sumdiv(k, d, #digits(d)) != n, k++); k; \\ Michel Marcus, Feb 21 2025