31710

Appears in sequences

• Numbers with exactly 5 distinct prime factors each of which is a palindrome.at n=3A046403
• Number of ways to place 2 nonattacking kings on an n X n board.at n=16A061995
• Numbers k such that 4*k-1, 8*k-1, 16*k-1 and 32*k-1 are all primes.at n=20A101794
• Numbers k such that 4*k-1, 8*k-1, 16*k-1, 32*k-1 and 64*k-1 are all primes.at n=3A101994
• Numbers n such that 2*10^n + 8*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=11A102962
• Numbers n for which 2n-1, 4n-1, 8n-1, 16n-1 and 32n-1 are primes.at n=5A124017
• Numbers k for which 2*k-1, 4*k-1, 8*k-1 and 16*k-1 are primes.at n=28A124494
• Numbers n such that 2n-1, 4n-1, 8n-1, 16n-1, 32n-1 and 64n-1 are primes.at n=1A125113
• Numbers k such that 64*k^6 + 1091 is prime.at n=32A155809
• Asymmetrical triangle sequence:t(n,m)=(-1)^m* Binomial[n, m] Pochhammer[ -n, m] - (-1)^n Pochhammer[ -n, n] + (-1)^( n - m)* Binomial[n, -m + n] Pochhammer[ -n, -m + n].at n=31A176063
• Asymmetrical triangle sequence:t(n,m)=(-1)^m* Binomial[n, m] Pochhammer[ -n, m] - (-1)^n Pochhammer[ -n, n] + (-1)^( n - m)* Binomial[n, -m + n] Pochhammer[ -n, -m + n].at n=32A176063
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of max(3i-2j, 3j-2i), as in A204158.at n=31A204159
• Number of n X 5 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=7A207388
• Number of n X 5 0..1 arrays with rows unimodal and antidiagonals nondecreasing.at n=5A224406
• T(n,k)=Number of nXk 0..1 arrays with rows unimodal and antidiagonals nondecreasing.at n=50A224409
• Number of 6Xn 0..1 arrays with rows unimodal and antidiagonals nondecreasing.at n=4A224413
• Triangular array read by rows. T(n,k) is the number of 2 tuple lists of length n that have exactly k coincidences; n >= 0, 0 <= k <= n.at n=40A226780
• Decimal equivalent of the binary string generated by the negation of the n X n identity matrix.at n=3A256275
• Binary "cubes"; numbers whose binary representation consists of three consecutive identical blocks.at n=29A297405
• Number of compositions of n whose run-lengths are either strictly increasing or strictly decreasing.at n=44A333191