21457

Appears in sequences

• Numbers k such that k^10 == 1 (mod 11^4).at n=14A056094
• Composite and every divisor (except 1) contains the digit 4.at n=14A062670
• Form a conjugate partition of row with 1+1+1 in first row. all other rows are the union of their parents. a(n) = number of types of piles in the n-th row.at n=28A064480
• a(n) = n^4 + 5*n^2 + 1.at n=12A082113
• Number of permutations of length n which avoid the patterns 1234, 1342, 4132.at n=9A116827
• a(n) = (1/2)*(n^3 - 6*n^2 + 13*n - 6).at n=36A158498
• Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=9A241308
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.at n=4A252098
• Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.at n=0A252102
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.at n=10A252105
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.at n=14A252105
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 846", based on the 5-celled von Neumann neighborhood.at n=40A273689
• Numbers k such that (10^k)/2 - 1 is prime.at n=16A295988
• MM-numbers of crossing set partitions.at n=25A324324
• Expansion of 1/sqrt((1 - x^3 - x^4)^2 - 4*x^7).at n=33A376721