1677721

Properties

Appears in sequences

• Expansion of (1-x)/(1-2*x+x^2-2*x^3).at n=22A007909
• Base 4 digits are, in order, the first n terms of the periodic sequence with initial period 1,2.at n=11A037481
• Largest prime substring in 2^n (or 0 if none exist).at n=24A046268
• Largest prime substring in 4^n (0 if none).at n=12A046270
• Largest prime substring in 8^n (0 if none).at n=8A046274
• a(n) = floor(8^8/n).at n=9A057070
• Expansion of 1/((1-x)*(1-2*x)*(1+x^2)).at n=20A077854
• Primes arising in A090525, or 0 if A090525(n) = 0.at n=6A090526
• Largest prime factor of 2^n-3.at n=21A093817
• a(n) = 3*a(n-1) + 4*a(n-2), a(0)=a(1)=1.at n=11A102900
• a(n) = floor(A140657(n+2)/10).at n=22A140659
• Number of n-step one-sided prudent walks, avoiding single west steps and single east steps.at n=21A190569
• a(n) = floor((2^n)/(3*n - 1)).at n=26A191629
• a(n) = floor((1 + 4^n)/(1 + 3*n)).at n=12A191639
• The subsequence A247649(2^n-1).at n=20A255490
• List of numbers of the forms (2^(4m+3)-3)/5 and (2^(12m+4)-3)/13 arranged in increasing order.at n=7A260953
• a(0)=1, a(1)=0, a(4n+2) = a(4n+3) = a(4n+5) = (4^(n+1) +(-1)^n)/5, a(4n+4) = (2*4^(n+1) -3*(-1)^n)/5.at n=44A274845
• Primes of the form floor(2^k / 5).at n=3A384697
• Prime numbersat n=126583