31528

Appears in sequences

• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (odd natural numbers), t = A001950 (upper Wythoff sequence).at n=40A024600
• Numbers which when multiplied by any repunit prime Rp give a Smith number.at n=14A104167
• Determinants of 3 X 3 matrices of discrete blocks of 9 consecutive primes.at n=33A117329
• To calculate n-th term, find all shortest common superstrings of the binary representations of all natural numbers from 1 to n, read them as numbers in base-2, and pick max.at n=14A175810
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=|x-y|+|y-z|.at n=15A212673
• Number of primes <= A214756(n).at n=16A214924
• Expansion of elliptic_K / elliptic_E in powers of q.at n=9A261976
• a(n) = Sum_{k=0..n} r_4(k^2 + 1), where r_4(k) is the number of ways of writing k as a sum of 4 squares (A000118).at n=20A333174
• Numbers that are the sum of four third powers in seven or more ways.at n=22A345150
• Numbers that are the sum of four third powers in exactly seven ways.at n=17A345151