A365505 a(n) is the least integer that can be expressed as the sum of a prime number and the n-th power of a positive integer in exactly n ways, or -1 if no such integer exists.

3, 6, 128, 1298, 375534

Offset: 1

Author

Ilya Gutkovskiy, Sep 07 2023

Keywords

• nonn
• more

Examples

			For n = 3: 128 = 3 + 5^3 = 101 + 3^3 = 127 + 1^3.
		

Crossrefs

Cf. A064283, A365290, A365292, A365504.