101024

Appears in sequences

• Numbers whose base-10 representation has exactly 6 runs.at n=12A043642
• a(n) = A061086(n) / n.at n=31A061087
• Sum of the first n weird numbers.at n=12A125114
• A coefficients of characteristic polynomials of A_n Cartan matrices times their transposes: t(n,m,d)=If[ n == m, 2, If[n == m - 1 || n == m + 1, -1, 0]]. M(d)=t(n,m,d)*Transpose[t(n,m,d)].at n=47A158199
• Number of binary strings of length n with equal numbers of 0001 and 1100 substrings.at n=18A164164
• Number of n X 7 binary arrays without the pattern 0 1 diagonally or antidiagonally.at n=10A188822
• Let x be the sum of the divisors d_i of k such that d_i | sigma(k). Sequence lists the numbers k for which x^2 = sigma(k).at n=8A284283
• a(n) = n^5 * Sum_{p|n, p prime} 1/p^5.at n=19A351245
• a(n) = Sum_{k=1..n} tau( (n/gcd(k,n))^n ).at n=43A373002