33330

Appears in sequences

• Denominators of Bernoulli numbers B_{2n}.at n=50A002445
• Numbers having four 3's in base 10.at n=12A043504
• Numbers with exactly 5 distinct prime factors each of which is a palindrome.at n=4A046403
• 4th level triangle related to Eulerian numbers and binomial transforms (A062254 is third level, A062253 is second level, triangle of Eulerian numbers is first level and triangle with Z(0,0)=1 and Z(n,k)=0 otherwise is 0th level).at n=33A062255
• Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly two ways.at n=10A076455
• Distinct values of denominators of Bernoulli numbers B(2n) in order of their appearance as n grows.at n=31A090126
• Averages of twin primes such that the sum of the lower, average and upper parts of the twin primes are averages of other twin primes.at n=16A132929
• Numbers k such that k and k^2 use only the digits 0, 1, 3, 8 and 9.at n=57A136852
• Denominator of BernoulliB(10^n).at n=2A139822
• a(n) = denominator(Bernoulli(prime(n) - 1)).at n=25A166062
• Numbers whose decimal expansion contains only 0's and 3's.at n=30A169966
• Number of permutations p of {1,...,n} satisfying p(1)=1 and, if n>1, |p(i)-p((i mod n)+1)| is in {2,3} for i from 1 to n.at n=46A174469
• Numbers k such that sum of the divisors of k equals the sum of the reversals of the divisors of k. Numbers with all palindrome divisors are not in the sequence.at n=18A196677
• Number of n X 5 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.at n=10A201372
• Numbers n such that n is the average of four consecutive primes n-13, n-1, n+1 and n+13.at n=3A260959
• Squarefree numbers n such that n^2 + 1 and n^2 - 1 are semiprime.at n=40A268697
• Take apart the sides of each of the integer-sided triangles with perimeter n (at their vertices) and rearrange them orthogonally in 3-space so that their endpoints coincide at a single point. a(n) is the total surface area of all rectangular prisms enclosed in this way.at n=39A308236
• Numbers m such that the largest digit in the decimal expansion of 1/m is 3.at n=31A350814
• Positive numbers k such that the decimal expansions of k and 1/k have the same nonzero digits.at n=25A376089
• Products of 5 distinct primes that are sandwiched between twin prime numbers.at n=24A376380