131074

Appears in sequences

• Numbers that are the sum of 4 nonzero 8th powers.at n=25A003382
• Numbers k such that k^2 is palindromic in base 16.at n=39A029733
• Number of ways to partition a 2-colored labeled set into identical subsets.at n=16A038042
• Number of conjugacy classes in Clifford group CL(n).at n=17A049332
• Row sums of even numbered rows of array T in A050870 (periodic binary words).at n=17A050871
• a(n) = 2^n + 2.at n=17A052548
• Inverse Moebius transform of powers of 2.at n=17A055895
• Number of elements in the continued fraction for Sum_{k=0..n} 1/2^2^k.at n=18A056469
• Numbers k such that sigma(phi(k)) is a prime.at n=37A062514
• Least integer m whose largest prime factor > m^(n/(n+1)).at n=15A063765
• Numbers k such that usigma(phi(k)) is a prime.at n=25A065875
• Solutions to phi(gpf(x)) - gpf(phi(x)) = 65534 = c are special multiples of 65537, x=65537*k, where the largest prime factors of factor k were observed in {2, 3, 5, 17, 257}.at n=1A070816
• Numbers k such that phi(k) is a perfect 8th power.at n=14A078168
• a(n) = (2^(n-1) + prime(n+1)-prime(n))/2.at n=18A085431
• a(n)=2a(n-1)+a(n-2)-2a(n-3).at n=16A087288
• a(n) = A089709(n+1)/A089709(n).at n=17A089985
• Unitary sigma-unitary phi super perfect numbers: USUP(USUP(n))= n/k for some integer k.at n=42A093863
• Bitwise XOR of adjacent terms of A101120; also the nonzero terms of A101122.at n=14A101121
• Total number of subsets of the n-th roots of 1 that add to zero.at n=34A103314
• a(n) = (A102371(n) + n)/2.at n=17A103745