101521

Appears in sequences

• Denominators of continued fraction convergents to sqrt(245).at n=10A041459
• Primitive part of Lucas(n).at n=27A061447
• Concatenation of next n positive triangular numbers.at n=2A133015
• Integer Quotients of Lucas Numbers; a rectangular array by downward antidiagonals.at n=24A143790
• a(n) = L(7*n)/L(n) where L(n) = Lucas number A000204(n).at n=3A153175
• Number of 2 X 2 matrices with all elements in {0,...,n} and prime determinant.at n=36A281315
• a(n) = L(8*n+4)/7, where L = A000032 (the Lucas sequence).at n=3A333718