79179

Appears in sequences

• a(n) = Sum_{k=1..n} (lcm(n,n-1,...,n-k+2,n-k+1)/lcm(1,2,...,k)).at n=20A093431
• Concatenations of pairs of primes that differ by 100.at n=7A103523
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = 1 - 2 S - S^2 + S^3.at n=11A291242