61279

Appears in sequences

• Expansion of 1/(x^k*(1-x-3*x^(k+1))) for k=9.at n=38A143460
• Number of (n+1)X(n+1) -5..5 symmetric matrices with every 2X2 subblock having sum zero and one, three or four distinct values.at n=5A211335
• Sequence of pairwise relatively prime numbers of class P_8 (see comment in A275246).at n=25A275253
• Numbers k such that sigma(k) - k - 1 is a perfect number.at n=18A293992