130561

Appears in sequences

• Strong pseudoprimes to base 2.at n=17A001262
• Composite numbers k such that k == +-1 (mod 8) and 2^((k-1)/2) == 1 (mod k).at n=35A006971
• Strong pseudoprimes to base 4.at n=34A020230
• Strong pseudoprimes to base 21.at n=31A020247
• Strong pseudoprimes to base 31.at n=21A020257
• Strong pseudoprimes to base 42.at n=32A020268
• Strong pseudoprimes to base 45.at n=24A020271
• Strong pseudoprimes to base 84.at n=33A020310
• Strong pseudoprimes to base 90.at n=30A020316
• Multiplicity of highest weight (or singular) vectors associated with character chi_127 of Monster module.at n=43A034515
• Brilliant Sarrus numbers.at n=14A086837
• a(n) = 2^(2n+1) - 2^(n+1) + 1.at n=8A092440
• Table of number of domino tilings of generalized Aztec pillows of type (1, ..., 1, 3, 1, ..., 1)_n.at n=44A112830
• a(n) = ceiling((2^n + 1 - 2*floor(2^(n/2)))/2).at n=17A129757
• Overpseudoprimes to base 2: composite k such that k = A137576((k-1)/2).at n=9A141232
• a(n) is the least base-2 overpseudoprime k such that the multiplicative order of 2 mod k equals 8*n+20.at n=5A141629
• Expansion of (1 + 4*x - 6*x^2 - 16*x^3 + 20*x^4)/((1-x)*(1-2*x)*(1+2*x)*(1-2*x^2)).at n=16A171663
• A symmetrical triangle read by rows: T(n, k) = 2^n*(q^k - 1)*(q^(n - k) - 1) + 1, where q = 2.at n=46A176793
• A symmetrical triangle read by rows: T(n, k) = 2^n*(q^k - 1)*(q^(n - k) - 1) + 1, where q = 2.at n=53A176793
• Fermat pseudoprimes to base 2 with two prime factors.at n=37A214305