34771

Appears in sequences

• Numbers k such that j(k)*phi(k) = sigma(phi(k)), j(k) = A033831(k).at n=14A033856
• Numbers n such that 2*P(n)+1, 2*P(n+1)+1, 2*P(n+2)+3, 2*P(n+3)+3 are also consecutive primes with P(i)=i-th prime.at n=0A103911
• Numbers n with k divisors such that n-1 and n+1 in binary representation have same number k of 0's as 1's.at n=36A191369
• Composite numbers and 1 which yield a prime whenever a 7 is inserted anywhere in them, including at the beginning or end.at n=42A216168
• Partial sums of A299281.at n=28A299282