89721

Appears in sequences

• Smallest k such that both k-n and k+n are primes and there are no primes between them.at n=32A087378
• Number of lambda calculus terms of size n, where size(lambda x.M) = 2 + size(M), size(M N) = 2 + size(M) + size(N), and size(V) = 1 + i for a variable V bound by the i-th enclosing lambda (corresponding to a binary encoding).at n=24A114851
• a(n) is the smallest number m, such that m+n is the next prime and m-n is the previous prime.at n=31A282690
• a(0) = 1, a(1) = 0, a(2) = 1; a(n) = a(n-1) + Sum_{k=0..n-3} a(k) * a(n-k-3).at n=20A357307