19269

Appears in sequences

• Convolution of A023531 and Lucas numbers.at n=20A023558
• Number of asymmetric (identity) trees with n nodes and 5 leaves.at n=16A055336
• Numbers n such that sigma(n) and d(n) are both harmonic (Ore) numbers.at n=9A071767
• Indices of primes in sequence defined by A(0) = 97, A(n) = 10*A(n-1) - 43 for n > 0.at n=12A101003
• Number of (n+1) X 2 0..3 arrays with no 2 X 2 subblock summing to less than 6.at n=2A184665
• Number of (n+1)X4 0..3 arrays with no 2X2 subblock summing to less than 6.at n=0A184667
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock summing to less than 6.at n=3A184673
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock summing to less than 6.at n=5A184673
• Constant term of the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=18A192981
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having x11-x00 less than x10-x01.at n=5A251801
• Number of (3+1)X(n+1) 0..3 arrays with no 2X2 subblock having x11-x00 less than x10-x01.at n=0A251803
• A255450(2^n-1).at n=7A255451
• Number of nX6 0..1 arrays with every element equal to 0, 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=6A299946
• Number of n X 7 0..1 arrays with every element equal to 0, 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=5A299947
• Terms k of A228058 such that gcd(k - A048250(k), A162296(k) - k) = A162296(k) - k.at n=30A325376
• Numbers k in A228058 such that also A001065(k) is in A228058.at n=25A325380
• Odd composites k such that sigma(k) has the same powerful part as k, where sigma is the sum of divisors function.at n=17A386425