71862

Appears in sequences

• Numbers k such that Sum_{d divides k} sigma(d)/phi(d) is an integer.at n=32A068991
• Weight distribution of [120,60,20] double circulant code.at n=5A080477
• Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having along the lower contour exactly k reentrant corners, i.e., a vertical step that is followed by a horizontal step (n>=1, k>=0).at n=22A121579
• Numbers k such that k^2 divides 5^k-1.at n=38A127105
• Integers n such that the century defined by the interval [100n+1, 100n+100] (i.e., the (n+1)-st century) contains exactly one Ormiston prime pair and no other primes.at n=10A162895