628992

Appears in sequences

• Theta series of E_8 lattice with respect to deep hole.at n=33A004017
• Numbers m such that m = s|t = phi(s)*sigma(t) for some numbers s and t, where "|" denotes concatenation.at n=8A159000
• T(n,k)=Number of (n+1)X(n+1) 0..k arrays with the array of 2X2 subblock determinants symmetric.at n=16A187457
• Number of (n+2) X 6 binary arrays avoiding patterns 001 and 101 in rows and columns.at n=9A202198
• Composite numbers such that product_{i=1..k} (p_i/(p_i-1)) / sum_{i=1..k} (p_i/(p_i-1)) is an integer, where p_i are the k prime factors of n (with multiplicity).at n=30A227034