116624

Appears in sequences

• Expansion of 1 / Sum_{n=-oo..oo} x^(n^2).at n=30A004402
• Number of overpartitions of n: an overpartition of n is an ordered sequence of nonincreasing integers that sum to n, where the first occurrence of each integer may be overlined.at n=30A015128
• Numbers m such that 2*m - sigma(m) is a divisor of m and greater than one, where sigma = A000203 is the sum of divisors.at n=22A060326
• The floor(n^(.9999))-perfect numbers, where f-perfect numbers for an arithmetical function f is defined in A066218.at n=3A066361
• Near-multiperfects with primes and powers of 2 excluded, abs(sigma(m) mod m) <= log(m).at n=42A117348
• Near-multiperfects with primes, powers of 2 and 6 * prime excluded, abs(sigma(n) mod n) <= log(n).at n=42A117349
• Near-multiperfects with primes, powers of 2, 6 * prime and 2^n * prime excluded, abs(sigma(n) mod n) <= log(n).at n=23A117350
• Numbers m whose abundance sigma(m) - 2m = -4. Numbers whose deficiency is 4.at n=9A125246
• Number of geometrically distinct open knight's tours of a 3 X n chessboard that have twofold symmetry.at n=19A169776
• Ceiling(n/2)-perfect numbers.at n=24A177050
• Deficient numbers with increasing abundancy without being powers of 2.at n=12A228450
• The total number of rectangles appearing in the Thue-Morse sequence logical matrices after n stages.at n=10A241684
• Deficient-perfect numbers: Deficient numbers n such that n/(2n-sigma(n)) is an integer.at n=39A271816
• Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.at n=4A283382
• Number of nX5 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.at n=3A283383
• T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.at n=31A283386
• T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.at n=32A283386
• Numbers k such that k - 2 | sigma(k).at n=12A298563
• Positive numbers n for which A000120(n) = k*A294898(n), with k < 0; numbers for which A326130(n) = sigma(n) - A005187(n).at n=8A326131
• Numbers n for which A294898(n) is not zero and A294898(n) divides A000120(n); numbers for which A326130(n) = abs(A294898(n)).at n=28A326132