27931

Appears in sequences

• Composite numbers n such that k! == 1 (mod n) for some k > 2.at n=26A049048
• a(n) = n^3 + n^2 + n + 1.at n=30A053698
• Numbers k such that A048138(k) is a prime and sets a new record for such primes.at n=39A064440
• Round(1000*x), where x is the solution to x = 5^(n-x).at n=30A104744
• Records in A071786.at n=45A151766
• a(n) is the reverse concatenation of divisors of n.at n=26A176558
• a(n) = A176558(A175354(n)) = numbers m as reverse concatenations of divisors of numbers from A175354, where A175354 = numbers k such that reverse concatenations of divisors of k are nonprimes.at n=20A176588
• Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically.at n=5A207726
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically.at n=50A207729
• Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically.at n=4A207733
• a(n) = (30^n - 1)/29.at n=4A218733
• The least common multiple of 1+n and 1+n^2.at n=30A281660
• Number of 4Xn 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=8A303042
• Position of the first occurrence of (0, 1, ..., n-1) in the digits of Pi written in base n.at n=4A307582
• Expansion of Product_{k>=1} 1 / (1 - 5^(k-1)*x^k).at n=7A338674
• a(n) = [x^n] x * Product_{j>=0} (1 + x^(2^j) + n*x^(2^(j+1))).at n=30A342643
• Heptagonal numbers which are products of three distinct primes.at n=20A356422
• a(n) is the number of reducible monic cubic polynomials x^3 + r*x^2 + s*x + t with integer coefficients bounded by naïve height n (abs(r), abs(s), abs(t) <= n).at n=43A358398
• Smallest k>1 such that 10*k^(3*2^n)+1 is prime.at n=12A381815