13981013

Properties

Appears in sequences

• a(n) = a(n-1) + 2*a(n-2), a(0)=2, a(1)=3.at n=23A048573
• a(n+1) = smallest number not containing any digits of a(n), working in base 4.at n=27A049548
• a(n) = 4*a(n-1) + 1 with a(0) = 3.at n=11A072197
• Numbers k such that A081252(m)/m^2 has a local maximum for m = k.at n=23A081254
• 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=23A086893
• a(n) is the least prime p such that exponent of highest power of 2 dividing 3p+1 equals n.at n=22A087964
• a(n) = 4*a(n-2) + 1 with a(1) = 0, a(2) = 3.at n=23A096773
• Least primes of the form k 4^n + (4^n-1)/3.at n=11A127598
• a(n) = 5*a(n-1) - 9*a(n-2) + 8*a(n-3) - 4*a(n-4), with a(0)=0, a(1)=0, a(2)=0, a(3)=1.at n=22A137221
• A generalized Jacobsthal sequence.at n=22A159290
• Primes p such that the greatest prime factor of 3*p+1 is at most 5.at n=16A276827
• a(n) = 4*a(n-2)+1 with initial terms 1,3,7.at n=23A283323
• Numbers of the form (2^(2*j + 6*k + 5) - 2^(2*j + 1) - 3)/9, with j,k >= 0.at n=26A342815
• Prime numbersat n=908940