28088

Appears in sequences

• Numbers k such that 2^k mod k = 2^k mod k^2.at n=39A068535
• Numbers k that are not powers of 2 such that 2^k mod k = 2^k mod k^2; or A068535 with powers of 2 excluded.at n=24A125773
• a(n) = n^5-n^4-n^3-n^2-n.at n=8A152017
• G.f. satisfies: A(x) = Sum_{n>=0} x^n*[Sum_{k=0..n} C(n,k)^3 *x^k* A(x)^(2k)].at n=8A187000
• a(n) = Sum_{i=0..n} digsum_4(i)^4, where digsum_4(i) = A053737(i).at n=47A231667
• G.f. satisfies: A(x) = 1 + x*A(x)^4 / (A(x) - x*A'(x)).at n=6A245768
• Numbers k such that the ring of integers of Q(2^(1/k)) is not Z[2^(1/k)].at n=32A342390