166725

Appears in sequences

• a(n) = 225*(n-1)*(n-2)/2.at n=37A027470
• Half the number of length n integer sequences with sum zero and sum of squares 1152.at n=4A157556
• Positive integers that are palindromes (of even length) in binary, each made by concatenating two identical binary palindromes.at n=34A161400
• Number of ways of writing n as the sum of 9 triangular numbers.at n=34A226253
• The hyper-Wiener index of the triangular graph T(n) (n >= 1).at n=26A228317
• Decimal values of the antidiagonals of the Sierpinski carpet considered as binary numbers.at n=17A292689
• a(n) = ord(2,A006935(n)/2), where ord(k,m) is the multiplicative order of k modulo m.at n=23A350084
• Integers k such that k = Sum k/(p_i + j), where p_i are the prime factors of k (with multiplicity). Case j = 2.at n=4A380901