A031587 - OEIS

%I #12 Jul 06 2024 16:13:16

%S 7923,7927,7947,7951,7963,7967,7971,8011,8023,8039,8051,8059,8067,

%T 8071,8087,8107,8111,8119,8123,8139,8143,8147,8159,8163,8167,8171,

%U 8179,8187,8191,8219,8227,8231,8243,8259,8263,8279,31688,31720,31784,31880,31904

%N Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 89.

%K nonn

%O 1,1

%A _David W. Wilson_