24041

Appears in sequences

• Numbers k such that 4*10^k + 3*R_k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=18A056707
• a(n) = Sum_{k=0..n} S(k)*S(n-k), convolution of S=A001644 with itself.at n=12A073782
• Numbers n such that n'' = n'+1 where n' and n'' are respectively the first and the second arithmetic derivative of n (A003415).at n=7A189639
• n for which A079277(n) + phi(n) < n.at n=21A208815
• Number of partitions of n with difference -6 between the number of odd parts and the number of even parts, both counted without multiplicity.at n=47A242686
• Numbers k such that 4*10^k + 87 is prime.at n=27A273097
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 533", based on the 5-celled von Neumann neighborhood.at n=14A282957
• a(n) is the trace of the n-th power of the 2 X 2 matrix [1 2; 3 4].at n=6A327765
• Numbers k for which sigma(k) = k + k'', where k'' is the second derivative of k (A068346).at n=8A348426
• Expansion of g.f. A(x) satisfying A( -x * A( x - x^2 ) ) = -x^2.at n=10A372528