31000

Appears in sequences

• a(n) = n*(n+5)*(n+6)*(n+7)/24.at n=25A005587
• Numbers k such that k^2 has digits in nonincreasing order.at n=41A028821
• Number of partitions of n with equal nonzero number of parts congruent to each of 0 and 2 (mod 3).at n=52A035538
• Multiples of 4 whose digits add to 4.at n=24A063997
• Full Łukasiewicz word for each rooted plane tree (interpretation e in Stanley's exercise 19) encoded by A014486 (or A063171).at n=14A079436
• Binomial transform of A084624.at n=11A084625
• Numbers k such that k and k^2 use only the digits 0, 1, 3, 6 and 9.at n=60A136850
• a(n) = (A138793(n+1)-A138793(n))/10^n.at n=11A138795
• Number of n X n arrays of squares of integers with every (n-3) X (n-3) subblock summing to 4 and every element equal to at least one neighbor.at n=4A146123
• Integers that can be generated with a C/C++ expression that is shorter than their decimal representation.at n=30A168650
• a(n) = 1, 7, A011557*(period 6: repeat 10, 13, 31, 49, 70, 97).at n=22A178508
• Number of 4X4 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal.at n=7A187707
• Number of standard Young tableaux of shape [4n,4].at n=7A215544
• a(n) = binomial(8*n,n)*(6*n+1)/(7*n+1).at n=4A215552
• Numbers whose squares became cubes if some digit is prepended, inserted or appended.at n=26A248127
• Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.at n=8A252262
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.at n=36A252269
• Sequence A261220 shown in factorial base: a(n) = A007623(A261220(n)).at n=50A260743
• The growth series for the affine Weyl group E_8.at n=10A267176
• "Inside numbers". Pick a term "t" and one of its digits "d". Now jump to the right over d digits if "d" is odd, and to the left over d digits if "d" is even. Whatever the "d" you choose, you will stay on "t".at n=29A284515