216717

Appears in sequences

• Numbers k such that k divides 1 + Sum_{j=1..k} prime(j)^2 = 1 + A024450(k).at n=28A128166
• Expansion of b(2)*b(4)*b(6)/(x^8-x^4-x+1), where b(k) = (1-x^k)/(1-x).at n=37A265055
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UU, HH, HD and DH.at n=30A329692
• Numbers k for which A003973(k) is equal to 2*sigma(k).at n=47A337384