39947

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers), t = (primes).at n=39A024604
• Smallest sets of 6 consecutive deficient numbers in arithmetic progression. The initial deficient number is listed.at n=7A231628
• G.f.: Sum_{k>=1} x^(2*k)/(1+x^(2*k)) * Product_{k>=1} 1/(1-x^k).at n=38A305121
• Number of crossing normal multiset partitions of weight n.at n=8A326277
• a(1) = 1; a(n) = a(n-1) + 2 * a(floor(n/2)).at n=45A347027
• Absolute discriminants of imaginary quadratic number fields with elementary bicyclic 5-class group (5,5).at n=7A359871