20552

Appears in sequences

• Numbers k such that 33*2^k - 1 is prime.at n=37A002240
• Integers n > 10553 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 10553.at n=17A063061
• BINOMIAL transform of A090351.at n=6A111342
• Times in hours, minutes and seconds (to the nearest second) at which the hour and minute hands of an analog clock, if interchanged, continue to indicate some other albeit accurate times, over a complete 12-hour sweep for the slower hand. Leading zeros omitted.at n=25A121577
• Number of binary strings of length n with equal numbers of 00010 and 11000 substrings.at n=15A164224
• Number of permutations of [n] that either have a fixed point or a succession, but not both.at n=8A207821
• Expansion of (2*x+1)*(1-x) / ( 1-2*x-4*x^2+6*x^3 ).at n=10A271893
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 486", based on the 5-celled von Neumann neighborhood.at n=37A272508
• Number of compositions of 5*n-1 into parts 4 and 5.at n=14A369849
• a(n) is the n-th number which can be represented as the sum of n distinct n-almost primes in exactly n ways, or -1 if fewer than n such numbers exist.at n=8A384842
• a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) + a(n-5) with a(1) = a(2) = a(3) = 0, a(4) = 1, and a(5) = 3.at n=19A385142
• a(n) = Sum_{k=0..floor(n/2)} binomial(k,2*(n-2*k)).at n=37A392250