28608

Appears in sequences

• Theta series of packing P_{10c}.at n=5A004021
• Numbers n such that n through n+5 have the same number of distinct prime factors.at n=32A045934
• Numbers k such that 5*10^k + R_k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=12A056713
• Triangle T(n,k) with the real part of [x^k] of the series (1-x)^(n+1)* sum_{j=0..infinity} (2*j+1+i)^n*x^j in row n, column k.at n=24A179068
• Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..6 array extended with zeros and convolved with 1,-2,1.at n=18A222151
• Number of n X n 0..2 matrices with each 2 X 2 subblock idempotent.at n=11A224659
• Smallest number k such that R(n) is the n-th divisor of k, where R(n) is the n-th Ramanujan prime (A104272).at n=12A233933
• Number of n X 2 binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.at n=10A268783
• Coefficients of orthogonal polynomials p(n, x) where p(n, 0) is A026150 with 1 prepended. Triangle read by rows, T(n, k) for 0 <= k <= n.at n=57A322941
• Number of doubly self-orthogonal diagonal Latin squares of order n with the first row in ascending order.at n=8A333367
• a(n) is the n-th nonnegative number to light exactly n segments when displayed on a calculator.at n=26A339700
• Number of partitions of the (n+2)-multiset {0,...,0,1,2} with n 0's into distinct multisets.at n=34A346822
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/2)} binomial(n-1,2*k) * a(k).at n=15A352044
• Numbers m such that 20*m + 1, 80*m + 1, 100*m + 1, and 200*m + 1 are all primes.at n=34A372186