70110

Appears in sequences

• G.f.: Product_{k>=1} (1 + 2*x^k).at n=43A032302
• Numbers k such that 169*2^k+1 is prime.at n=22A032461
• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives z numbers.at n=11A125492
• Number of nonisomorphic graded posets with 0 and non-uniform Hasse graph of rank n, with exactly 2 elements of each rank above 0.at n=10A206947
• a(n) = (1/24)*n*(n - 1)*(n - 3)*(n - 14).at n=41A319930
• Those primitive elements of A337386 that have exactly one primitive nondeficient divisor (A006039).at n=27A341604