47989

Appears in sequences

• Numbers k such that k^2 is palindromic in base 6.at n=23A029990
• Base-6 digits are, in order, the first n terms of the periodic sequence with initial period 1,0.at n=6A033116
• Sums of 4 distinct powers of 6.at n=20A038480
• Numbers whose base-6 representation has exactly 7 runs.at n=0A043615
• a(n) = n^3 + n^2 + n + 1.at n=36A053698
• a(n) = n^6 + n^4 + n^2 + 1.at n=6A059830
• a(n) = ((2*n)^(2*n+2) - 1)/(4*n^2 - 1).at n=3A066210
• Numbers of the form (6^{mr}-1)/(6^r-1) for positive integers m, r.at n=13A076285
• Numbers k such that phi(k) is a perfect sixth power.at n=26A078166
• Numbers n such that sigma_3(n) is divisible by square of cototient of n, while n is not a prime number.at n=21A091286
• Modulo 2 binomial transform of 6^n.at n=6A100309
• Numbers n such that 5*10^n + 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=25A103016
• Composite numbers k for which k - phi(k) divides k-1.at n=15A160599
• T(n,k) = (k^n)*U(n, (1/k + k)/2), where U(n,x) is the n-th Chebyshev polynomial of the second kind, square array read by antidiagonals upward (n >= 0, k >= 1).at n=41A173588
• Numbers n such that 10^n + 2*n - 1 is prime.at n=15A174175
• Numbers of the form k^3+k^2+k+1 that are the product of two distinct primes.at n=5A176070
• a(n) = (36^n - 1)/35.at n=4A218739
• Semiprimes of the form n^3 + n^2 + n + 1.at n=6A237627
• Vinogradov's number J_{3,2}(n).at n=18A281391
• The least common multiple of 1+n and 1+n^2.at n=36A281660