MAIN We can package a sum over n into a set of sums with a triangular number like stride. We can see this by taking the integers, removing the triangular numbers, then shifting by one, removing the triangular numbers again 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,\cdots\\ .,2,.,4,5,.,7,8,9,.,11,12,13,14,.,16,17,18,19,20,.,22,23,24,25,26,27,.,29,30,\cdots\\ .,.,.,.,5,.,.,8,9,.,.,12,13,14,.,.,17,18,19,20,.,.,23,24,25,26,27,.,.,30,\cdots\\ .,.,.,.,.,.,.,.,9,.,.,.,13,14,.,.,.,18,19,20,.,.,.,24,25,26,27,.,.,.,\cdots\\ and so on ^\infty f(n) = }f(n) + }f(n) + }f(n) + \cdots the first coefficients of the latter sums take the formula c_{1,0}=1\\ c_{1,n}={2}(3n+n^2) where we are calling the first sum 0 and the later sums 1, 2, 3, 4, ⋯, n, ⋯. Then we have that c_{n,0}={2}\\ c_{n,1}=1+{2} = 1+c_{n,0} \\ c_{n,2}=2+{2} = 1+c_{n+1,1} = 2+c_{n+1,0} \\ c_{n,3}=3+c_{n+2,0} \\ c_{n,4}=4+c_{n+3,0} \\ c_{n,m}=m+c_{n+m-1,0} = m + {2}, \;m>0 so we can rewrite ^\infty f(n) = ^\infty f(c_{n,0}) + ^\infty f(c_{n,1}) + ^\infty f(c_{n,1}) + \cdots\\ ^\infty f(n) = ^\infty ^\infty f(c_{n,m}) \\ ^\infty f(n) = ^\infty f\left({2} \right)+ ^\infty ^\infty f\left(m + {2}\right) Is this useful? It seems to complicate things alot, for example the normal example \zeta(2)=^\infty {n^2}={6} The first term is easy S_0=^\infty \left({2}\right)^{-2} = {3}(\pi^2-9) the rest is then S_1=^\infty {(1+8n)^{3/2}} \left(2(\psi_0(t_-)-\psi_0(t_+))+(\psi_1(t_-)+\psi_1(t_+)) \right) with ψn the polygamma function, and t_+= {2} + n +{2} \\ t_-= {2} + n -{2} we then must have that S₀ + S₁ = π²/6. So S_1={6}(72-7\pi^2) But we can also write a chain of expressions for the mth sum, {6} = {3}(4\pi^2-36) + {27}(4\pi^2-31) + S_2 + \cdots but some of these sums are hard to write here. We find the value indeed converges towards the required value of S₁ ≈ 0.485462. The sum is not particularly efficient. ZETA(3) We can work towards a sum for ζ(3) though! We find from similar treatment we have \zeta(3)= 8(10-\pi^2) - ^\infty {(1+8n)^{5/2}}\Bigg( 12(\psi_0(t_-)-\psi_0(t_+)) + 6( \psi_1(t_-) + \psi_1(t_+)) + (1+8n)(\psi_2(t_-)-\psi_2(t_+)) \Bigg) and the remaining terms converge on the correct number 0.15889211187406554. For triangular numbers, the summand simplifies to a nicer form. SUM ^\infty {2^n} = 1 so then when we perform ^\infty 2^{-(n(n+1)/2)} = {2^{7/8}}\theta_2(0,{})-1 ^\infty ^\infty 2^{-\left(m+{2}\right)} for m = 1 we get {2\cdot2^{7/8}}\theta_2(0,{})-{2} GENERATING FUNCTIONS We may write the set of powers of x as generating functions as follows T={2}\theta_2(0,) for elliptic theta, then -1+x^{-1/8}T = x + x^3 + x^6 + x^{10} + x^{15} + x^{21} + x^{28} + \cdots \\ -x + x^{7/8}T = x^2+x^4+x^7+x^{11}+x^{16}+x^{22} + \cdots\\ -x^2(1+x) +x^{15/8}T = x^5 + x^8 + x^{12} + x^{17} + x^{23} + x^{30} + \cdots \\ and the general term becomes -1+x^{-1/8}T, \;n=0 \\ -x^n\left(^{n-1} x^{k(k+1)/2}\right) + x^{(8n-1)/8}T = ^\infty x^{n+(k+n-1)(k+n)/2}, \;n>0 Thus {1-x} = -1+x^{-1/8}T + ^\infty -x^n\left(^{n-1} x^{k(k+1)/2}\right) + x^{(8n-1)/8}T \\ {1-x} = A + ^\infty -x^n\left(^{n-1} x^{k(k+1)/2}\right) where A= -1+x^{-1/8}T + ^\infty x^{(8n-1)/8}T\\ A = )}{(2-2x)x^{1/8}} -1 where A + 1 is the beautiful series 1 + 2x + 2x^2 + 3x^3 + 3x^4 + 3x^5 + 4x^6 + 4x^7 + 4x^8 + 4x^9 + \cdots with n of each coefficient! This then gives B = ^\infty -x^n\left(^{n-1} x^{k(k+1)/2}\right) = -x-x^2-2x^3-2x^4-2x^5-3x^6-3x^7-3x^8-3x^9-\cdots