22502

Appears in sequences

• a(0) = 1, a(n) = 25*n^2 + 2 for n > 0.at n=30A010015
• Fibonacci sequence beginning 5, 11.at n=17A022136
• a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n+1-k), where k = floor((n+1)/2), s = A023531, t = (Fibonacci numbers).at n=22A024318
• a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n+1-k), where k = floor((n+1)/2), s = A023531, t = (F(2), F(3), ...).at n=21A024322
• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023531, t = (F(2), F(3), F(4), ...).at n=20A024885
• a(n) = T(n,1) + T(n-1,2) + ...+ T(n-k+1,k), where k = floor((n+1)/2) and T is the array defined in A026098.at n=47A026103
• Multiplicity of highest weight (or singular) vectors associated with character chi_21 of Monster module.at n=42A034409
• If a Fibonacci sequence is formed with first term = number of digits in n and second term = sum of decimal digits in n, then n itself occurs as a term in the sequence after the first two terms.at n=19A038868
• Expansion of Product_{k>=1} (1+x^k)^A001055(k).at n=41A066806
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (0, -1), (0, 1), (1, 0)}.at n=11A151395
• Numbers n such that there is no triangular n-gonal number greater than 1.at n=37A188892
• Number of right triangles on an (n+1) X 5 grid.at n=28A189809
• Numbers n such that Q(sqrt(n)) has class number 9.at n=35A218041
• Smallest even k such that the pair {k-3,k-1} is not a twin prime pair and lpf(k-1) > lpf(k-3) >= prime(n), where lpf = least prime factor (A020639).at n=31A242720
• Smallest even k such that the pair {k-3,k-1} is not a twin prime pair and lpf(k-1) > lpf(k-3) >= prime(n), where lpf = least prime factor (A020639).at n=32A242720
• Smallest even k such that the pair {k-3,k-1} is not a twin prime pair and lpf(k-1) > lpf(k-3) >= prime(n), where lpf = least prime factor (A020639).at n=33A242720
• Least even k such that sfdf(k-1) > sfdf(k-3) >= A050376(n), where sfdf(n) is the smallest Fermi-Dirac factor of n (A223490), and k-3 is not the lesser of a pair of Fermi-Dirac twin primes (A229064).at n=38A244412
• Least even k such that sfdf(k-1) > sfdf(k-3) >= A050376(n), where sfdf(n) is the smallest Fermi-Dirac factor of n (A223490), and k-3 is not the lesser of a pair of Fermi-Dirac twin primes (A229064).at n=39A244412
• Least even k such that sfdf(k-1) > sfdf(k-3) >= A050376(n), where sfdf(n) is the smallest Fermi-Dirac factor of n (A223490), and k-3 is not the lesser of a pair of Fermi-Dirac twin primes (A229064).at n=40A244412
• Numbers m such that psi(x) = phi(m) has a solution while sigma(y) = phi(m) has none.at n=23A291524