24800
domain: N
Appears in sequences
- a(n) = (7*n+1)*(7*n+6).at n=22A001526
- Numbers that, when expressed in base 4 and then interpreted in base 10, yield a multiple of the original number.at n=37A032540
- Group successively larger prime numbers so that the sum of the n-th group is a multiple of n. Sequence gives the sum for each group.at n=15A074128
- A characteristic triangle for the Euler totient function (A000010).at n=37A110032
- Triangle T, read by rows, where row n+1 of T = row n of T^(2^n) with appended '1' for n>=0 with T(0,0)=1.at n=23A132625
- Row sums of triangle A134480.at n=30A134481
- Number of ways to place 2 queens on an n X n chessboard so that they attack each other.at n=24A144945
- a(n) = (9*n+2)*(9*n+7).at n=17A177072
- a(n) = A016755(n) - A001845(n).at n=15A188050
- Larger member of primitive friendly pairs ordered by smallest maximal element.at n=25A233039
- Numbers k such that 6*10^k + 91 is prime.at n=30A265938
- Number x = concat(MSD(x),b) such that MSD(x)*b = phi(x), where MSD(x) is the Most Significant Digit of x and phi(x) is the Euler totient function of x.at n=26A286130
- Numbers k such that [prime(k), prime(k+1), prime(k+2)] = [1, 2, 3] mod 11.at n=31A302767
- Larger of amicable pair m < n defined by t(n) = m and t(m) = n where t(n) = psi(n) - n and psi(n) = A001615(n) is the Dedekind psi function.at n=13A323330
- Concatenating all successive absolute differences between two successive digits of a(n) produce a subchain of a(n).at n=57A338855
- Numbers which are the sum of a prime and the square of the next prime.at n=35A349660
- Dirichlet inverse of function f(n) = 1+(A003415(n)*A276086(n)), where A003415 is the arithmetic derivative and A276086 is the primorial base exp-function.at n=35A359603
- Expansion of g.f. A(x) satisfying 4 = Sum_{n=-oo..+oo} (-x)^n * (4*A(x) + x^(n-1))^(n+1).at n=5A363104
- Lexicographically earliest sequence of distinct terms > 1 such that no term is a substring of the product of any two terms.at n=30A381242
- Primitive terms in A066192: number k such that k is a term of A066192 and k/2 is not.at n=17A383428