A277925 Odd squares and 8 times odd squares, sorted.

1, 8, 9, 25, 49, 72, 81, 121, 169, 200, 225, 289, 361, 392, 441, 529, 625, 648, 729, 841, 961, 968, 1089, 1225, 1352, 1369, 1521, 1681, 1800, 1849, 2025, 2209, 2312, 2401, 2601, 2809, 2888, 3025, 3249, 3481, 3528, 3721, 3969, 4225, 4232, 4489, 4761, 5000, 5041, 5329, 5625, 5832, 5929, 6241

Offset

1,2

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Formula

Sum_{n>=1} 1/a(n) = 9*Pi^2/64. - Amiram Eldar, Jun 02 2022

Maple

N:= 10000: # to get all terms <= N
sort([seq(k^2, k=1..floor(sqrt(N)), 2), seq(8*k^2, k=1..floor(sqrt(N/8)), 2)]); # Robert Israel, Nov 18 2016

Mathematica

max = 6000; Sort[Join[Table[n^2, {n, 1, Floor[Sqrt[max]], 2}], Table[8*n^2, {n, 1, Floor[Sqrt[max/8]], 2}]]] (* Amiram Eldar, Jun 02 2022 *)

Crossrefs

Cf. A016754.

Sequence in context: A226230 A258400 A173336 * A173745 A305828 A322652

Adjacent sequences: A277922 A277923 A277924 * A277926 A277927 A277928

Keyword

nonn,easy

Author

N. J. A. Sloane, Nov 04 2016, based on a suggestion from Benoit Cloitre.

Extensions

More terms from Joerg Arndt, Nov 05 2016

Status

approved