104281

Properties

Appears in sequences

• Number of staircase polygons of area n with one (staircase polygon) hole on square lattice (not allowing rotations).at n=10A057414
• Primes with 26 as smallest positive primitive root.at n=7A061731
• Odd integers k such that 10^k - 1 - 10^((k-1)/2) is a prime of the form 9...989...9, called a palindromic wing prime or a near-repdigit palindromic prime.at n=7A077794
• Consider the array T(n, m) = m-th prime of the form n*i(i+1)/2 +/- 1. This sequence is the main diagonal.at n=32A125765
• Primes of the form x^2 + 5*y^2, where x and y=x+1 are consecutive natural numbers.at n=30A176608
• Smallest prime k such that (k+p(1)) (k+p(2))...(k+p(n))/(p(n)#) is an integer.at n=16A215490
• Smallest prime k such that (k+p(1)) (k+p(2))...(k+p(n))/(p(n)#) is an integer.at n=17A215490
• Minimal order of degree-n irreducible polynomials over GF(19).at n=10A218362
• Lesser of two consecutive primes, p < q, such that p*q + p - q and p*q - p + q are also consecutive primes.at n=31A225726
• Base-10 representation of the primes at A262639.at n=3A262640
• a(n) = Sum_{d|n} (-1)^omega(n/d) * phi(rad(n/d)) * p(d), where p = A000041 (partition numbers).at n=45A333697
• Irregular table read by rows, T(n, k) is the rank of the k-th Genocchi permutation of {1,...,n}, permutations sorted in lexicographical order. If no Genocchi permutation of {1,...,n} exists, then T(n, 1) = 0 by convention.at n=29A347599
• Number of integer partitions of n that are not of length 2 and do not contain n/2.at n=46A365825
• Prime numbersat n=9958