68859

Appears in sequences

• Gaps of 2 in sequence A038593 (upper terms).at n=31A038644
• Triangle T(n,k) (n >= 2, k = 3..n+floor(n/2)) giving number of bicoverings of an n-set with k blocks.at n=28A059443
• Number of 4-block bicoverings of an n-set.at n=7A059945
• Wieferich numbers (1): n > 1 such that 2^A000010(n) == 1 (mod n^2).at n=12A077816
• Numbers m such that m^2 divides 2^k - 1 for some k, 0 < k <= m.at n=29A246503
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=23A252525
• Odd numbers m such that sigma(x) = m has more than 1 solution.at n=23A300869
• Numbers that begin a run of 3 consecutive odd valued terms in A360519.at n=18A361112