51131

Properties

Appears in sequences

• a(n) = floor(n*(n-1)*(n-2)*(n-3)/31).at n=37A011941
• Primes with all odd digits such that the next three primes also contain all odd digits.at n=30A068831
• Primes with all odd digits such that the next four primes also contain all odd digits.at n=8A068832
• Number of (3412,1234)-avoiding involutions in S_n.at n=39A085583
• Lesser prime factor of semiprimes in A089542.at n=28A089543
• Primes p such that |100-p|, |1000-p|, |10000-p| and |100000-p| are also primes.at n=34A126021
• Numbers such that the digital sums in bases 2, 3, 5 and 7 all are equal.at n=38A135127
• Numbers such that the digital sums in bases 2, 3, 5 and 10 all are equal.at n=10A135128
• Primes p = prime(k) of form 13//r, s//13 or t//13//u and sod(p) = sod(k).at n=27A169645
• Base-6 pandigital primes: primes having at least one of each digit 0,1,2,3,4,5 when written in base 6.at n=9A175278
• a(n) = 6*n^3 - 263*n^2 + 3469*n - 12841.at n=36A218457
• Lower twin prime-indexed primes in the sequence of prime(prime(i)).at n=4A228054
• Least prime factor of (2n+1)^(2n+1)+2.at n=14A228613
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 107", based on the 5-celled von Neumann neighborhood.at n=41A270166
• Primes that are palindromic in factorial base.at n=33A333421
• k such that 0 = Sum_{j=1..k} A373223(k, j). The indices of the rows in Gauss's triangle with vanishing row sums.at n=41A373181
• Number of face-connected components of irregular pyramidal cells in the square quarter pyramidille up to translation, rotation, and reflection of the honeycomb.at n=9A385275
• Prime numbersat n=5231