19994

Appears in sequences

• a(n) = (5*n + 1)^2 + 4*n + 1.at n=28A007533
• Coordination sequence for MgNi2, Position Ni2.at n=35A009932
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MFS = ZSM-57 H1.5[Al1.5Si34.5O72] starting with a T6 atom.at n=13A019177
• Denominators of convergents to Pi by Farey fractions.at n=44A063673
• Numbers k such that R(k+6) = 2.at n=3A086946
• a(n) = 25*n^2 - 36*n + 13.at n=29A154355
• Number of nX2 0..7 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.at n=19A201095
• a(n) = a(n-1) + floor((a(n-2) + a(n-3))/2), with a(n)=1 for n < 3.at n=25A214041
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 78", based on the 5-celled von Neumann neighborhood.at n=42A270093
• Number of palindromic compositions of n into prime parts.at n=55A276420
• Numbers n with the property that k*n and (k+1)*n have a common nonzero digit for all k.at n=28A308466
• Divide the positive integers into subsets of lengths given by successive primes. a(n) is the sum of primes contained in the n-th subset.at n=28A344718