21398

Appears in sequences

• Convolution of Lucas numbers and A000201.at n=15A023621
• Inverse binomial transform of A064413.at n=14A065972
• a(1)=1, a(n) is the smallest integer > a(n-1) such that the largest element in the simple continued fraction for S(n)=1/a(1)+1/a(2)+...+1/a(n) equals prime(n).at n=26A070901
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w^2>x^2+y^2.at n=35A211810
• Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.at n=7A259720
• Sum of primes between 100*n and 100*n + 99.at n=21A276355
• a(n) is the number of distinct five-cuboid combinations filling an n X n X n cube only with at least one cut spanning through the full cube.at n=11A384737