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

Author

Paolo Xausa, Oct 02 2024

Keywords

• nonn
• base

Comments

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

Examples

			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.
		

Links

• Dario Alpern, 4-Brilliant Numbers.

Crossrefs

Subsequence of A376704.

Cf. A078972, A083182, A376703, A376705.