19823

Appears in sequences

• Sum of the first n primes whose indices are primes.at n=42A083186
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (0, 1, 1), (1, -1, 1), (1, 0, -1), (1, 1, 1)}.at n=7A151013
• Numerator of H(n+4) - H(n), where H(n) = Sum_{k=1..n} 1/k.at n=19A189642
• Positions of 0's in A330314.at n=19A330325