236527

Properties

Appears in sequences

• Number of permutations of 1..n avoiding adjacent step pattern up, down, up, up.at n=9A177521
• a(1) = 2; thereafter, a(n) is the smallest prime not yet used which is compatible with the condition that a(n) is a non-quadratic residue modulo a(k) for the next n indices k = n + 1, n + 2, ..., 2n.at n=28A249797
• a(n) is the least prime p such that the sum of n consecutive primes starting with p has exactly n prime factors, counted with multiplicity, or 0 if no such p exists.at n=17A339185
• Prime numbersat n=20946