30232

Appears in sequences

• Number of Twopins positions.at n=20A005684
• Number of stacked directed animals on the square lattice.at n=9A059712
• Expansion of (1+t^2+4*t^3+2*t^4+t^5+3*t^6)/((1-t)^2*(1-t^2)*(1-t^3)^2).at n=31A100779
• a(n) = 7*a(n-1)-6*a(n-3)+a(n-5).at n=9A107413
• Numbers n such that z(n) and z(n+1) are both prime, where z(n) = a^d + b^d + c^d + ..., where a*b*c* ... is the prime factorization of n and d is the largest digit of n.at n=22A109280
• Sum of digits of n-th even perfect number.at n=22A138828
• Nonhomogeneous three-term sequence a(n) = a(n-1) + a(n-2) + n.at n=18A179991
• Numbers k such that (10^(2*k+1)+15*10^k-1)/3 is prime.at n=9A183177
• Numbers k such that there is 1 prime between 100*k and 100*k + 99.at n=45A186393
• E.g.f. satisfies: A(x) = x + sin(A(x))*sinh(A(x)).at n=5A214770
• exp( Sum_{n>=1} x^n/n^4 ) = Sum_{n>=0} a(n)*x^n/n!^4.at n=4A217145
• Number of compositions of n where every distinct subsequence (not necessarily contiguous) has a different sum.at n=43A334268
• a(n) = (n!)^n * [x^n] exp(Sum_{k>=1} x^k / k^n).at n=4A336441
• Numbers with decimal expansion d_1, ..., d_w such that for any k in 1..w there is some m in 1..w such that d_k = d_m = abs(k - m).at n=25A336880