23158

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 90 ones.at n=20A031858
• Numbers k such that k-th and (k+1)-st term of A038593 differ by 4.at n=12A038635
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0111-1100-0111 pattern in any orientation.at n=18A147372
• Expansion of 1/( (1 + x)^2 * (1 - x^2*(1 + x)^2) ).at n=25A375373