54613

Appears in sequences

• a(n) = a(n-1) + 2*a(n-2), a(0)=2, a(1)=3.at n=15A048573
• a(n+1) = smallest number not containing any digits of a(n), working in base 4.at n=19A049548
• Grundy function for turn-at-most-9-coins game.at n=20A054046
• a(n) = 4*a(n-1) + 1 with a(0) = 3.at n=7A072197
• Positions of check bits in code in A075946.at n=4A075948
• Numbers n such that C(4n,n)/(3n+1) (A002293) is not divisible by 4.at n=44A078971
• Numbers k such that A081252(m)/m^2 has a local maximum for m = k.at n=15A081254
• a(n) is the index of F(n+1) at the unique occurrence of the ordered pair of reversed consecutive terms (F(n+1),F(n)) in Stern's diatomic sequence A002487, where F(k) denotes the k-th term of the Fibonacci sequence A000045.at n=15A086893
• a(n) = 4*a(n-2) + 1 with a(1) = 0, a(2) = 3.at n=15A096773
• Array read by antidiagonals. Rows contain odd numbers reaching same odd successor in Collatz function iteration.at n=37A099730
• a(n) = n^3 - 7*n + 7.at n=37A106734
• Triangle of sums of Jacobsthal numbers related to binomial(4n,n)/(3n+1) mod 4.at n=35A113049
• a(n) = (n + 1/3)*2^(n-1) - 1/2 + (-1)^(n-1)*(1/6).at n=12A127981
• A generalized Jacobsthal sequence.at n=14A159290
• Locations of row maxima in "crushed" version of Stern's diatomic array.at n=29A169969
• Numbers of form 4^(3*k+l+1)/9 - 4^l/9 - 1/3 or 2*4^(3*k+l+2)/9 - 2*4^l/9 - 1/3, k,l>=0.at n=30A172143
• Array T(n,k) of odd Collatz preimages read by antidiagonals.at n=43A178415
• Dispersion of A016813 (4k+1, k>1), by antidiagonals.at n=47A191667
• Odd numbers producing exactly 3 odd numbers in the Collatz (3x+1) iteration.at n=19A198584
• Least n such that L(n)<-1 and L(n)<L(n-1), where L(k) means the least root of the polynomial p(k,x) defined at A206284, and a(1)=13.at n=6A206444