25800

Appears in sequences

• Sum of first prime(n) primes.at n=26A022094
• Expansion of (5 - 9*x + 6*x^2)/(1-x)^4.at n=42A080957
• a(n) is the least k such that k*Mersenne_prime(n)^2 - 1 and k*Mersenne_prime(n)^2 + 1 are twin primes.at n=9A098817
• Triangle read by rows, related to A108283.at n=25A108284
• Terms of A007504 divisible by 3.at n=32A249679
• Square array A(row,col) read by antidiagonals: A(1,col) = A256450(col-1), and for row > 1, A(row,col) = A255411(A(row-1,col)); Dispersion of factorial base shift A255411 (array transposed).at n=49A257503
• Square array A(row,col): A(row,1) = A256450(row-1), and for col > 1, A(row,col) = A255411(A(row,col-1)); Dispersion of factorial base shift A255411.at n=50A257505
• Least positive integer k such that (k-1)^2+(k*n)^2, k^2+(k*n-1)^2, (k+1)^2+(k*n)^2 and k^2+(k*n+1)^2 are all prime.at n=27A261382
• Average of twin prime pairs that is a product of two averages of twin prime pairs.at n=41A307758
• G.f. A(x) satisfies: A(x) = 1 + x*A(x^2)/(1 - x)^2.at n=41A307889
• Number of regions after generation n of Conant's dissection of a square when dissected with both diagonal and orthogonal lines and where the starting edges rotate clockwise around the square and the dissection halves in size every second generation.at n=16A335632
• Average of a twin prime pair which is the sum of the first k primes, for some k.at n=1A366205
• G.f. satisfies A(x) = A(x^2)*A(x^3) / (1-x).at n=43A382126