A049228 sigma(n)-n is a perfect square associated with A049226.

25, 49, 1156, 2809, 1369, 169, 225, 3025, 4489, 5929, 441, 5329, 25281, 10609, 37249, 10609, 27889, 24649, 1225, 22801, 80089, 37249, 85849, 34225, 187489, 1849, 208849, 157609, 76729, 2401, 82369, 267289, 64009, 130321, 3771364, 555025, 966289, 310249, 344569

Offset: 1

Author

Enoch Haga

Keywords

• easy
• nonn

Examples

			a(27) = 208849 = 457^2 is a term since sigma(A049226(27)) - A049226(27) = 208849.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..300

Crossrefs

Cf. A000005, A000203, A049226, A049227.

Formula

a(n) = A000203(A049226(n)) - A049226(n). - Amiram Eldar, Aug 15 2019

Extensions

Offset corrected and more terms added by Amiram Eldar, Aug 15 2019