A049226 -id:A049226 - cp's OEIS frontend

A049227 Sigma(n) / d(n) is a perfect square associated with A049226.

36, 144, 196, 400, 900, 1764, 3136, 2304, 3844, 4900, 12100, 7056, 13689, 9216, 6400, 15876, 25600, 44100, 93636, 57600, 32400, 69696, 81796, 94864, 57600, 213444, 72900, 152100, 152100, 360000, 230400, 260100, 298116, 435600, 298116, 254016, 291600, 656100

Offset: 1

Enoch Haga

			a(27) = 72900 = 270^2 is a term since sigma(A049226(27))/d(A049226(27)) = 72900.

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

Cf. A000005, A000203, A049226, A049228.

a(n) = A000203(A049226(n)) / A000005(A049226(n)). - Amiram Eldar, Aug 15 2019

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

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

Original entry on oeis.org

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

Enoch Haga

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

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

Cf. A000005, A000203, A049226, A049227.

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

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

cp's OEIS Frontend

A049227 Sigma(n) / d(n) is a perfect square associated with A049226.

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