56505

Appears in sequences

• a(n) = Sum_{j=1..n} j*prime(j).at n=34A014285
• Number of (n+4) X 10 0..1 matrices with each 5 X 5 subblock idempotent.at n=17A224688
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 334", based on the 5-celled von Neumann neighborhood.at n=8A271282
• Triangle, read by rows, that transforms diagonals in the array A274390 of coefficients in successive iterations of Euler's tree function (A000169).at n=23A274570
• Column 2 of triangle A274570.at n=4A274573
• Numerator of the barycenter of first n primes defined as a(n) = numerator(Sum_{i=1..n} (i*prime(i)) / Sum_{i=1..n} prime(i)).at n=34A306834