a(n) is the smallest integer k such that sigma_2(k) = sigma_2(k + 2n), where sigma_2(k) is the sum of squares of divisors of k (A001157).

A175199

a(n) is the smallest integer k such that sigma_2(k) = sigma_2(k + 2n), where sigma_2(k) is the sum of squares of divisors of k (A001157).

Terms

    a(0) =24a(1) =430a(2) =645a(3) =860a(4) =120a(5) =864a(6) =168a(7) =1720a(8) =1935a(9) =10790a(10) =264a(11) =2580a(12) =2795a(13) =1570a(14) =16185a(15) =3440a(16) =408a(17) =3870a(18) =456a(19) =21580a(20) =2355a(21) =4730a(22) =552a(23) =5160a(24) =600a(25) =5590a(26) =5805a(27) =3140a(28) =696a(29) =4320

External references