22331

Appears in sequences

• Discriminants of quintic fields with 2 complex conjugates (negated).at n=37A023684
• a(n) is the smallest composite number c such that A002110(n) + c is prime.at n=32A038771
• k th digit of a(n) = number of different digits within 2 places of k (not including k).at n=15A039987
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=3, I={-1,0,2}.at n=37A080001
• Brilliant numbers such that when they are concatenated with their 10's complement, which also must be brilliant, the result is a prime.at n=2A084629
• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11000-01111-11000 pattern in any orientation.at n=13A147453
• Semiprimes whose prime factors are of equal binary length and which differ from each other in exactly three bit positions.at n=39A261075
• a(n)^2 is the end of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245).at n=42A340664
• G.f. A(x) satisfies: A(x) = 1 + x + x^2 + x^3 + x^4 + x^5 + x^6 * A(x/(1 - x)) / (1 - x)^2.at n=18A351755
• Numbers j in pairs (j,k), with j <> k +- 1, such that the sum of their cubes is equal to a centered cube number.at n=38A352135
• a(n) = (3*(2*n - 1)^2*((2*n - 1)^2 + 2) + 2*n + 1)/2 for n > 0.at n=5A352757
• Sum of those numbers t which have a unique representation as the sum of floor(n/2) distinct squares from among 1^2,...,n^2.at n=10A374510