26182

Appears in sequences

• a(n) is the concatenation of n and 7n.at n=25A009441
• a(n) = [ a(n-1)/a(1) + a(n-1)/a(2) + ... + a(n-1)/a(n-1) ] for n >= 3, with initial terms 1,2.at n=14A022861
• a(n) = [ a(n-1)/a(1) + a(n-1)/a(2) + ... + a(n-1)/a(n-1) ] for n >= 3, with initial terms 2,2.at n=15A022867
• Values of Newton-Gregory forward interpolating polynomial (1/3)*(n-1)*(2*n+3)*(2*n-1).at n=27A030440
• Numbers k such that (3^k + 5)/2 is prime.at n=24A058960
• a(n) = n^4 - n^3 - n^2 - n.at n=13A152016
• G.f.: exp( Sum_{n>=1} (x^n/n) * Sum_{d|n} d*sigma(n/d,d) ).at n=18A198301
• Principal diagonal of the convolution array A213831.at n=18A213832
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 595", based on the 5-celled von Neumann neighborhood.at n=29A273142
• a(n) = 1 + Sum_{k=0..n-4} binomial(n-3,k) * a(k).at n=14A344491
• Total number of partitions of all numbers <= n with designated summands, n >= 0.at n=21A384998