A375471 Integers equal to the sum of divisors of their anti-divisors.

3, 4, 16, 61, 1861, 4979, 90191, 58981439, 10024953661

Offset: 1

Author

Paolo P. Lava, Aug 17 2024

Keywords

• nonn
• hard
• more

Comments

Tested up to 2*10^10. - Giovanni Resta, Aug 19 2024

Examples

			Anti-divisors of 1861 are 2, 3, 17, 51, 61, 73, 219, 1241 and
sum of sigmas = 3 + 4 + 18 + 72 + 62 + 74 + 296 + 1332 = 1861.
		

Crossrefs

Cf. A000203, A066417, A178029.

Extensions

a(8)-a(9) from Giovanni Resta, Aug 19 2024