36847

Properties

Appears in sequences

• a(n) = Sum_{i=0..n} T(i,n-i), array T as in A049723.at n=32A049724
• Prime number spiral (clockwise, Southwest spoke).at n=31A054568
• Numbers n such that the number formed by the digits of 2n sorted in ascending order is equal to the sum of the divisors of n after the digits of each divisor have been sorted in ascending order.at n=9A083387
• Number of 8k+-3 primes (A003629) in range [2^n,2^(n+1)].at n=19A095014
• a(n) = A007290(n+2) - 1 = 2*C(n+2,3) - 1.at n=47A108766
• Primes p such that p-+1, p-+3, p-+5 are not squarefree.at n=8A155145
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 549", based on the 5-celled von Neumann neighborhood.at n=32A272844
• Numbers k such that 431*2^k+1 is prime.at n=27A323031
• Prime numbers P such that Q=2*P-1, R=4*Q+1, S=6*R+1, T=8*S-1, U=10*T+1 and V=12*U-1 are all prime numbers.at n=2A330304
• Prime numbersat n=3907