17938

Appears in sequences

• Let (u1,u2) be successive untouchable numbers such that phi(u1) = phi(u2); sequence gives values of u1.at n=36A048189
• Number of 5-multiantichains of an n-set.at n=5A084872
• Numbers n such that 8*10^n + R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=6A103071
• Numbers whose binary representation traces a nonselfcrossing circuit in honeycomb lattice when its bits (from the least to the second most significant bit) are interpreted as directions to proceed at each vertex. (The most significant 1-bit is ignored).at n=53A255571
• Those terms of A255571 whose every A080541/A080542-rotation is also a term of A255571.at n=27A258001
• Indices of primes in A026007.at n=44A285223
• Number of nX6 0..1 arrays with every element equal to 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.at n=16A298091