126976

Appears in sequences

• Expansion of (theta_3(z^4)^3 + theta_2(z^4)^3)^4.at n=21A028697
• a(n) = 8^(n-1)*(2^n - 1).at n=4A060195
• Numbers n such that usigma(cototient(n)) is a prime.at n=13A063719
• a(0) = 1; for n>0, a(n) = number of distinct sums of subsets of {1, 1/2, 1/3, 1/4, ..., 1/n} (allowing the empty subset).at n=20A072207
• Stirling2 triangle with scaled diagonals (powers of 8).at n=16A075503
• Number of Pythagorean triples mod 2^n; i.e., number of solutions to x^2 + y^2 = z^2 mod 2^n.at n=8A091143
• Maximum number of odd 2 X 2 submatrices over all 2n X 2n (0,1) matrices.at n=15A093699
• Triangle, read by rows, where row n equals the inverse binomial transform of the crystal ball sequence for D_n lattice.at n=43A108556
• Let S(n)=Sigma(n)/2. Numbers n such that S(S(n))=n, 1/2-Sociable number of order 1 or 2.at n=22A113791
• Record values in A003415 (arithmetic derivative).at n=40A131116
• Numbers with 26 divisors.at n=9A137489
• Numbers of length n binary words with fewer than 7 0-digits between any pair of consecutive 1-digits.at n=17A145115
• a(0) = 9, a(n) = 2*a(n-1) + 2^(n-1) for n > 0.at n=13A159697
• a(n) = Sum_{d|n} Möbius(n/d)*d^5/phi(n).at n=15A160893
• Conjectured list of smallest members of fully k-sociable cycles of order r.at n=22A183026
• Conjectured list of fully multisociable numbers.at n=41A183029
• Number of 0..n arrays x(0..3) of 4 elements with each no smaller than the sum of its previous elements modulo (n+1).at n=29A200253
• Number of (w,x,y,z) with all terms in {0,...,n} and w, x, and y even.at n=30A212759
• Lexicographically earliest sequence such that (i) the binary plot of the sequence is symmetric with respect to the line y=x and (ii) the derived sequence (A000265(a(n))) contains only distinct terms.at n=15A240972
• Multiply a(n-1) by 2 and drop all 0's.at n=20A242350