23070

Appears in sequences

• Numbers k such that 9*10^k - 11 is prime.at n=14A100275
• Expansion of g.f.: x*(1-11*x+x^2)/(1-17*x+14*x^2-x^3).at n=4A100297
• a(1) = a(2) = 1; a(n+1) = round( a(n) + sqrt(3)*a(n-1) ).at n=16A133999
• Number of n X 7 binary arrays without the pattern 0 1 diagonally, vertically or antidiagonally.at n=32A188864
• Number of Lucas-Carmichael numbers less than 10^n.at n=12A216929
• Number of 2 X n arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..2 2 X n array.at n=21A219628
• The Wiener index of the nanostar dendrimer G[n], defined pictorially in the Nadjafi-Arani et al. reference.at n=2A221010
• Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=8A259003
• Squared end-to-end distance of irreducible endless self-avoiding walks of length n for the simple cubic lattice.at n=4A334327
• a(n) is the first number k such that there are exactly n pairs of primes p < q with p + q = k such that p*q - k and p*q + k are both prime.at n=44A358822