42813

Appears in sequences

• Strong pseudoprimes to base 91.at n=15A020317
• Divide natural numbers in groups with prime(n) elements and add together.at n=19A034957
• Row sums of the triangle A105160.at n=19A105157
• Numbers n such that 2*reversal(n)=sigma(n).at n=7A105324
• 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, 0), (0, -1, 1), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.at n=9A149362
• Numbers k such that sopfr(k) = tau(k)^2.at n=29A305026
• Odd numbers k that can be factored to such a pair of coprime factors x and y that A347381(k) < min(A347381(x), A347381(y)).at n=19A347390