68839

Appears in sequences

• Squarefree n such that the elliptic curve n*y^2 = x^3 - x arising in the "congruent number" problem has rank 3 and nontrivial SHA[2].at n=1A062694
• Number of (n+1)X(n+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal.at n=2A236738
• Number of (n+1)X(3+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal.at n=2A236741
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal.at n=12A236746
• a(n) = n^3 - 2*n.at n=41A242135
• a(n) = n*(6*n^2 - 8*n + 3).at n=23A272378
• Numbers whose septenary, octal and nonary representations are prime when read in decimal.at n=39A281252
• Number of 5-element subsets of [n] having a prime element sum.at n=30A320680