26985

Appears in sequences

• LCM-convolution of squares A000290 with themselves.at n=16A033456
• Numbers whose base-4 representation contains exactly four 1's and four 2's.at n=27A045109
• Number of Hamiltonian planar graphs with n nodes.at n=8A049366
• Number of primitive (period n) periodic palindromes using a maximum of six different symbols.at n=9A056497
• Numbers n such that sigma(n - phi(n)) = phi(n + phi(n)).at n=3A074887
• List of codewords in binary lexicode with Hamming distance 8 written as decimal numbers.at n=14A075940
• Triangle of coefficients of certain polynomials used with prime numbers as variables in the computation of the array A103728.at n=40A103718
• Column m=4 sequence of triangle A103718(n,m), n>=0, without leading zeros.at n=4A103721
• 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, -1, 0), (-1, 0, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 0)}.at n=10A148591
• Stirling-like triangle by rows generated from (x-1)*(x-1)*(x-2)*(x-3)*(x-4)*...at n=49A158471
• Triangle read by rows: T(n,k) is the number of cycle-up-down permutations of {1,2,...,n} having k cycles (1<=k<=n).at n=50A186366
• Rows of negated binary Walsh matrices interpreted as reverse binary numbers.at n=22A228540
• Composite numbers k such that Sum_{i=1..t-1} d(i+1)/d(i) is prime, where d(1), ..., d(t) are the divisors of k in ascending order.at n=28A255585
• Numbers whose distance to the nearest cube equals the distance to the nearest product of 3 consecutive integers (three-dimensional oblong).at n=29A342873