39168

Appears in sequences

• Triangle of coefficients of Euler polynomials 2^n*E_n(x) (exponents in increasing order).at n=47A004174
• Triangle of coefficients of Euler polynomials 2^n*E_n(x) (exponents in decreasing order).at n=52A004175
• Numbers k such that 5*2^k + 3 is prime.at n=53A058586
• a(n) = product of all even numbers between n-th prime and (n+1)-st prime.at n=10A061216
• Numbers k such that the sum of 2nd, 3rd, 4th and 5th powers of divisors of k are divisible by sum of divisors of k.at n=12A074632
• Euler's totient of numbers containing in their decimal representation only the digits 0 and 1.at n=33A077811
• Numbers k such that Omega(k) = Omega(k-1) + Omega(k-2) + Omega(k-3) + Omega(k-4) where Omega(k) denotes the number of prime factors of k, counting multiplicity.at n=33A078095
• A unitary phi reciprocal amicable number: consider two different numbers r, s which satisfy the following equation for some integer k: uphi(r) = uphi(s) = (1/k) * r * s / (r-s); or equivalently, 1/uphi(r) = 1/uphi(s) = k * (1/s - 1/r); sequence gives s numbers.at n=18A080767
• Distance from n!+1 to next larger square.at n=11A082995
• Binomial transform of decagonal numbers A001107.at n=9A086950
• Numbers k such that k^2 = x^3 + y^4 with positive integers x, y.at n=40A087209
• Triangle read by rows: nonzero coefficients of polynomials 2^n*E(n,x), with E the Euler polynomials.at n=33A099932
• 18th root of theta series in A109005.at n=4A109006
• Triangle read by rows: T(n,k) number of tilings of a 2n X 3 grid by dominoes, 2k of which are in a vertical position (0<=k<=n).at n=63A123519
• a(n) = 4*a(n-1) + 4*a(n-2), n>2, a(0)=1, a(1)=3, a(2)=15.at n=7A155117
• a(n) = 121*n^2 - 2*n.at n=17A157040
• Coefficient triangle of permutation-based polynomials: p(x,n)=Product[x - n!/(n - i)!, {i, 0, n}].at n=16A158451
• Number of non-congruent solutions to x^2 + y^2 + z^2 + t^2 == 1 (mod n).at n=33A208895
• Even numbers in A221715.at n=48A213218
• First position of A218860(n) in A066135.at n=21A218861