A365507 a(n) is the least positive integer that can be expressed as the sum of one or more consecutive n-almost primes in exactly n ways, or -1 if no such integer exists.
2, 10, 105, 2410, 45010, 708408
Offset: 1
Examples
For n = 3: 105 = 3*5*7 = 2*2*3 + 2*3*3 + 2*2*5 + 3*3*3 + 2*2*7 = 2*2*5 + 3*3*3 + 2*2*7 + 2*3*5.
Links
- Eric Weisstein's World of Mathematics, Almost Prime.