A049228 - OEIS

%I #16 Aug 10 2024 22:33:44

%S 25,49,1156,2809,1369,169,225,3025,4489,5929,441,5329,25281,10609,

%T 37249,10609,27889,24649,1225,22801,80089,37249,85849,34225,187489,

%U 1849,208849,157609,76729,2401,82369,267289,64009,130321,3771364,555025,966289,310249,344569

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

%H Amiram Eldar, <a href="/A049228/b049228.txt">Table of n, a(n) for n = 1..300</a>

%F a(n) = A000203(A049226(n)) - A049226(n). - _Amiram Eldar_, Aug 15 2019

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

%Y Cf. A000005, A000203, A049226, A049227.

%K easy,nonn

%O 1,1

%A _Enoch Haga_

%E Offset corrected and more terms added by _Amiram Eldar_, Aug 15 2019