25228

Appears in sequences

• Numerators of continued fraction convergents to sqrt(820).at n=10A042582
• Susceptibility series H_5 for 2-dimensional Ising model (divided by 2).at n=7A054389
• Numbers k that divide Sum_{j=1..k} A051953(j) where A051953(j) = j - Phi(j). Arithmetic mean of first k cototient values is an integer.at n=11A063986
• Structured tetragonal anti-prism numbers.at n=27A100182
• Numbers which when multiplied by any repunit prime Rp give a Smith number.at n=12A104167
• Earliest sequence such that (x+y) | a(xy) for all x>=1, y>=1.at n=51A169901
• Number of Dyck paths of semilength n having exactly 5 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).at n=5A243417
• Number of squares of all sizes in 3*n*(n+1)/2-ominoes in form of three-quarters of Aztec diamonds.at n=39A258440
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 241", based on the 5-celled von Neumann neighborhood.at n=31A270990