2097131

Properties

Appears in sequences

• a(n) = 2^n - n.at n=21A000325
• Primes of the form 2^i*3^j - (i+j) with i, j >= 0.at n=22A069356
• a(n) = 2^(2*n+1)*Sum_{k=1..2*n} binomial(2*n+1,k)*Bernoulli(k)/2^k.at n=9A069993
• a(n) = ceiling(n^(1/n))^n - n.at n=20A076878
• Primes of the form 2^k - k.at n=5A081296
• a(n) = 3*a(n-1) - a(n-2) - 3*a(n-3) + 2*a(n-4).at n=20A084173
• Double, add 0, double, add 1, double, add 2, double, add 3, etc.at n=40A147678
• Least prime divisor of 2^n - n which does not divide any 2^k - k with 0 < k < n, or 1 if such a primitive prime divisor of 2^n - n does not exist.at n=20A242292
• a(n) = Numerator of (0 followed by 1's) - n/2^n.at n=21A273153
• a(n) is the least prime p such that Omega(p + n) = n where Omega is A001222, or 0 if no such prime exists.at n=20A345740
• Greatest prime dividing 2^n - n for n>=2; a(1) = 1.at n=20A359684
• Prime numbersat n=155609