31110

Appears in sequences

• Triangle of Gaussian binomial coefficients [ n,k ] for q = 13.at n=12A022177
• Numbers k such that k^2 is palindromic in base 13.at n=30A029998
• Numbers whose set of base-13 digits is {1,2}.at n=34A032933
• a(n) = n*(4*n^4 + 1).at n=6A069078
• Numbers divisible by the sum of factorials of their digits [A061602(n)] and also terminate in the sum of factorials of their digits.at n=22A071064
• G.f.: (3-4*x-3*x^2)/(1-2*x-3*x^2+2*x^3).at n=10A107334
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=9.at n=29A135194
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 1, -1), (1, 1, 0)}.at n=9A149326
• Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=6A207365
• Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=4A207372
• Palindromic in bases 11 and 13.at n=23A249157
• Expansion of Product_{k>=1} (1 + x^k) * (1 + x^(k^2)) * (1 + x^(k^3)).at n=47A369575
• Expansion of Sum_{1<=i<=j} q^(i+j)/( (1-q^i)*(1-q^j) )^2.at n=44A374929
• Products of 5 distinct primes that are sandwiched between squarefree semiprime numbers.at n=28A376949
• Numbers k for which sigma(k - x) + sigma(k + x) = 8*k has at least one nonnegative solution.at n=7A384841
• Smallest m >= 2*n such that binomial(m,n) is a multiple of m-i for all 0<=i<n, but one.at n=16A389360