25285

Appears in sequences

• Fibonacci sequence beginning 1, 25.at n=16A022395
• Number of ordered triples (a, b, c) with gcd(a, b, c) = 1 and 1 <= {a, b, c} <= n.at n=30A071778
• a(n) = A077702(n+1)/A077702(n).at n=26A077703
• a(n) = A088418(n+1)/A088418(n).at n=26A088419
• Alternating row sums of triangle A090447.at n=6A090451
• Pentagonal numbers for which the sum of the digits is also a pentagonal number.at n=16A117709
• Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and having k 1-cell columns starting at level 0 (0<=k<=n). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=48A121585
• Numbers which are both lucky and pentagonal.at n=11A128511
• a(n) = (1/9)*(7*2^n + (-1)^n*(3*n+2)) - (n-1)^2.at n=15A140991
• Numerator of Euler(n, 5/18).at n=4A156651
• Centered 28-gonal numbers.at n=42A195314
• Beach-Williams Pell numbers of type k^2 + 4.at n=7A212083
• Number of nX6 0..1 arrays with every element equal to 0, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=6A302458
• Number of 7Xn 0..1 arrays with every element equal to 0, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=5A302465
• Pentagonal numbers which are products of three distinct primes.at n=28A381650