A365493 a(n) is the smallest number which can be represented as the sum of n n-almost primes in exactly n ways, or -1 if no such number exists.

2, 18, 44, 112, 418, 776, 1408, 3072, 7040, 14848, 53056, 77312, 147456, 315392, 988160, 5310464, 3194880, 6225920, 12845056, 46252032, 76873728, 117440512, 258998272, 1072824320, 1111490560, 3379560448, 5192548352, 9261023232, 24243077120, 41204842496, 81067507712

Offset: 1

Author

Ilya Gutkovskiy, Sep 07 2023

Keywords

• nonn

Examples

			For n = 2: 18 = 2*2 + 2*7 = 3*3 + 3*3.
		

Links

• Eric Weisstein's World of Mathematics, Almost Prime.

Crossrefs

Cf. A091538, A365494.

Extensions

More terms from David A. Corneth, Jun 12 2025