33027

Appears in sequences

• All 81 combinations of prefixing and following a(n) by a single digit are nonprime.at n=20A032734
• Composite numbers k such that all the decimal concatenations ik and ikj (i, j = 1...9) are also composite.at n=13A032737
• Squarefree part of numerator of the squared area of the Heronian triangle with sequential odd sides whose shortest leg is 2*n+1.at n=50A334176
• Fold a square sheet of paper alternately vertically to the left and horizontally downwards; after each fold, draw a line along each inward crease; after n folds, the resulting graph has a(n) edges.at n=15A342761
• Numbers k such that the k-th composition in standard order is a concatenation of distinct twins (x,x).at n=39A351009