5974

Properties

Appears in sequences

• Number of unlabeled connected planar simple graphs with n nodes.at n=8A003094
• Larger members of g-reduced amicable pairs a < b such that sigma(a) = sigma(b) = a + b + gcd(a,b).at n=22A054572
• a(n) = gcd(a(n-1),n-1)*a(n-1) + d(n-1) if a(n-1) is not divisible by 2, otherwise a(n) = a(n-1)/2, where gcd denotes common divisor, d(n) is number of divisors of n.at n=50A133904
• Smallest k such that 3^(3^n) - k is prime.at n=9A140331
• a(n) = 144*n^2 - 161*n + 45.at n=6A156711
• Zero-less composite numbers such that exactly eight distinct anagrams are primes.at n=38A163651
• The index of the least triangular number greater than 1 that is also an n-gonal number, or 0 if none exists.at n=67A188893
• Numbers n where abs(s(n)) produces a new minimum, with s(1) = 1 and s(i) = s(i-1) - sign(s(i-1))*(1/i).at n=46A203812
• Number of (n+2)X4 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order.at n=2A204636
• Number of (n+2) X 5 0..3 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order.at n=1A204637
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order.at n=7A204642
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order.at n=8A204642
• Sum of the first n binary palindromes; a(n) = Sum_{k=1..n} A006995(k).at n=40A206920
• Numbers n such that n^16+1 and (n+2)^16+1 are both prime.at n=15A217991
• Number of n X 2 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=37A239594
• Bernoulli number B_{n} has denominator 354.at n=15A255684
• p*B_(p-1)+1 modulo p^2, where p = prime(n) and B_i denotes the i-th Bernoulli number.at n=26A268000
• Sum over all partitions of n of the number of distinct parts i of multiplicity i.at n=35A276428
• Even numbers not divisible by 3 which are not of the form p + 3^x with p prime.at n=44A282430
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 593", based on the 5-celled von Neumann neighborhood.at n=15A283181