A376706 a(n) = largest 4-brilliant number (A376704) with n decimal digits.

90, 875, 2401, 99671, 999973, 9991291, 88529281, 999997283, 9999998329, 99999997711, 988053892081, 9999999999809, 99999999988979, 999999999991541, 9892436613211441, 99999999999805729, 999999999999968753, 9999999999999834493, 99964004859708406561, 999999999999999959833

Offset

2,1

Comments

See Alpern link for more terms, along with their prime factorization.

Links

Table of n, a(n) for n=2..21.

Dario Alpern, 4-Brilliant Numbers.

Example

a(6) = 999973 because 999973 = 13 * 13 * 61 * 97 is the largest 6-digit number with four prime factors having the same number of digits.

Crossrefs

Subsequence of A376704.

Cf. A078972, A083182, A376703, A376705.

Sequence in context: A097372 A263170 A321303 * A101243 A173483 A202960

Adjacent sequences: A376703 A376704 A376705 * A376707 A376708 A376709

Keyword

nonn,base

Author

Paolo Xausa, Oct 02 2024

Status

approved