60691

Appears in sequences

• Strong pseudoprimes to base 15.at n=13A020241
• Strong pseudoprimes to base 18.at n=26A020244
• Strong pseudoprimes to base 59.at n=36A020285
• Strong pseudoprimes to base 63.at n=29A020289
• Central heptanomial coefficients: largest coefficient of (1+x+...+x^6)^n.at n=7A025012
• Numbers k such that Euler phi(k) / Carmichael lambda(k) = 34.at n=9A066698
• Doubly restricted composition numbers: number of compositions of 1+2+3+...+n = n(n+1)/2 into exactly n positive integers each no more than n.at n=7A077045
• Triangle read by rows, T(n, k) = [x^k] (1-x)^(n+1)*Sum_{j=0..n} binomial(n + n*j + j, n*j + j)*x^j.at n=24A108267
• The size of the largest antichain in the 7-dimensional hypercubic lattice of size n; also the coefficient of x^floor(7*(n-1)/2) in (1 + x + ... + x^(n-1))^7.at n=6A133458
• Square array read by diagonals: T(n,k) = number of arrays of n integers in -k..k with sum equal to 0.at n=42A201552
• Number of arrays of 7 integers in -n..n with sum zero.at n=3A201554
• T(n,k)=Number of zero-sum nXk -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors.at n=21A201958
• T(n,k)=Number of zero-sum nXk -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors.at n=27A201958
• Smallest number k such that A049559(k) / A187730(k) = n.at n=16A284440