19922

Appears in sequences

• a(n) = 7^n+5^n-2n.at n=5A121201
• a(n) = 2^n*Product_{k=1..floor((n-1)/2)} (1 + 2*cos(k*Pi/n)^2 + 4*cos(k*Pi/n)^4).at n=9A152103
• Number of 1..2 integer arrays v[1..n] of length n with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..n-1.at n=15A171276
• Number of 1..n integer arrays v[1..16] of length 16 with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..15.at n=1A171353
• Expansion of 1/((1-2*x)*(1-3*x+3*x^2)*(1-4*x+6*x^2-4*x^3)).at n=8A201458
• Number of 0..n arrays of length 4 with 0 never adjacent to n.at n=10A212837
• Numbers k such that (31*10^k - 1)/3 is prime.at n=19A283112
• Triangle read by rows: numerators of coefficients (highest degree first) of polynomials interpolating Fibonacci numbers.at n=33A322044
• Numbers k such that 435*2^k+1 is prime.at n=45A323146
• Numbers with arithmetic derivative which is a palindromic prime number (A002385).at n=33A359332
• Numbers that are a sum of both four and six consecutive prime numbers.at n=34A380433
• Numbers k such that the total number of digits d in the numbers from 1 to k is even for each d from 0 to 9.at n=41A380642