22278

Appears in sequences

• a(n) = digit reversal of A103741(n).at n=37A103763
• a(n) = digit reversal of A103764.at n=11A103837
• Triangle T, read by rows, equal to the matrix cube of triangle A113106, which satisfies the recurrence: A113106(n,k) = [A113106^5](n-1,k-1) + [A113106^5](n-1,k).at n=12A113110
• Sum of the squares of the quadratic nonresidues of prime(n).at n=14A125617
• Averages of twin prime pairs which are a sum of averages of two consecutive twin prime pairs.at n=34A160916
• Number of obtuse triangles on a centered hexagonal grid of size n.at n=4A241226
• Numbers n such that n is the average of four consecutive primes n-5, n-1, n+1 and n+5.at n=38A258088
• Squarefree numbers n such that n^2 + 1 and n^2 - 1 are semiprime.at n=28A268697
• Number of compositions (ordered partitions) of n into an even number of cubes.at n=55A339420
• Averages k of twin primes such that the sum (with multiplicity) of prime factors of k-1, k and k+1 is prime.at n=42A340060
• a(n) = floor(Sum_{k=n^3..(n+1)^3} k^(1/3)).at n=19A374384