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

1,1

Links

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

Formula

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

Example

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

Crossrefs

Cf. A000005, A000203, A049226, A049228.

Sequence in context: A245530 A138202 A204106 * A368682 A016910 A005017

Adjacent sequences: A049224 A049225 A049226 * A049228 A049229 A049230

Keyword

easy,nonn

Author

Enoch Haga

Extensions

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

Status

approved