665281

Appears in sequences

• Smallest triangular number which is one more than the product of n distinct numbers > 1.at n=7A081951
• Records in A111273.at n=26A113732
• Numbers of the form p*q, p and q prime with q=2*p-1.at n=22A129521
• Highly composite numbers + 1.at n=36A135372
• Composite numbers k such that 2^k-2 and 3^k-3 are both divisible by k and k is not a Carmichael number (A002997).at n=22A153513
• a(n) = A185128(n) + A185129(n).at n=15A185243
• Poulet numbers (2-pseudoprimes) of the form 7200*n^2 + 8820*n + 2701.at n=7A214016
• Fermat pseudoprimes n to base 3 for which sqrt(8*n + 1) is an integer.at n=32A217841
• Squarefree numbers (from A005117) with prime divisors in a 2p-1 progression.at n=24A231814
• Record values in A265388.at n=25A265395
• Fermat pseudoprimes to base 2 that are triangular.at n=18A293622
• Fermat pseudoprimes to base 2 that are hexagonal.at n=17A322130
• Odd numbers > 1, not powers of primes, for which A326147(n) is equal to abs(A326146(n)).at n=30A326148
• Chebyshev pseudoprimes to both base 2 and base 3: composite numbers k such that T(k, 2) == 2 (mod k) and T(k, 3) == 3 (mod k), where T(k, x) is the k-th Chebyshev polynomial of the first kind.at n=24A330208
• Numbers that are super pseudoprimes to both bases 2 and 3.at n=10A333130
• Record values in A346599.at n=28A346601
• Constant term in the expansion of (1 + x*y*z + w*y*z + w*x*z + w*x*y + 1/(w*x*y*z))^n.at n=12A361675
• Triangle read by rows: T(n, k) = Sum_{i=0..k-2} (-1)^(i+2) * (k-i-1)^n * binomial(k,i).at n=32A366159
• Triangular numbers that are emirpimes.at n=19A375385