32491

Properties

Appears in sequences

• Smallest number m such that m^2+1 is divisible by A002144(n)^2 (= squares of primes congruent to 1 mod 4).at n=36A059321
• Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <=6 (i.e., when d = 2, 4 or 6) and forming d-pattern = [6, 6, 4]; short d-string notation of pattern = [664].at n=23A078858
• Prime numbers p such that p +- ((p-1)/3) are primes.at n=30A137703
• Greatest prime factor of 2*n^4 + 1.at n=32A140538
• Noncomposite numbers in the western ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American.at n=16A168025
• Primes of the form 10n^2 + 1.at n=18A201709
• Number of nX1 0..3 arrays with no more than floor(nX1/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..3 order.at n=9A222650
• Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.at n=4A222872
• T(n,k)=Number of nXk 0..3 arrays with no more than floor(nXk/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.at n=19A222878
• Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 1.at n=12A244455
• Primes p such that 2*p + 43 is a square.at n=15A269787
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 969", based on the 5-celled von Neumann neighborhood.at n=28A273849
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+32478) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=16A274058
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+32478) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=18A274058
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+32478) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=33A274058
• a(n) = number of regions in the configuration A290447(n).at n=31A290865
• a(n) is the number of nonnegative numbers < 10^n with all digits distinct.at n=5A344389
• Discriminants of imaginary quadratic fields with class number 39 (negated).at n=38A351677
• Prime numbers that precede and follow consecutive balanced primes.at n=1A374507
• Prime numbersat n=3486