22218

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers), t = (odd natural numbers).at n=40A024590
• Number of step shifted (decimated) sequence structures using a maximum of three different symbols.at n=12A056392
• Numbers n such that d(n + d(n)) = d(n), where d(n) is the sum of the distinct primes dividing n.at n=26A175760
• Integer areas A of the integer-sided triangles such that the product of the inradius and the circumradius is a square.at n=28A232329
• For k in {2,3,...,9} define a sequence as follows: a(0)=0; for n>=0, a(n+1)=a(n)+1, unless a(n) ends in k, in which case a(n+1) is obtained by replacing the last digit of a(n) with the digit(s) of k^2. This is k(4).at n=34A237341
• a(0) = 0, a(n) = previous term + repunit of length of previous term for n > 0.at n=38A247107
• Number of ways to write n as an ordered sum of 6 primes (counting 1 as a prime).at n=40A341985
• a(n) is the area of the rectangle whose edges are n and A375673(n).at n=43A375675