28251

Appears in sequences

• Numbers k such that k divides the sum of the digits of k^(2k).at n=22A108859
• Numbers k with property that 19*k + {2,4,8,10} are two pairs of consecutive twin primes.at n=9A152926
• Odd numbers divisible by 3 which are neither of the form p + 3^m + 1 nor of the form p + 3^m - 1 with p prime.at n=2A282191
• Numbers k such that (13*10^k + 401)/9 is prime.at n=19A289811
• Number of nX4 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.at n=4A304593
• Number of nX5 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.at n=3A304594
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.at n=31A304597
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.at n=32A304597
• Numbers k such that s(k) = s(k+1), where s(k) is the unitary analog of the alternating sum-of-divisors function (A307037).at n=17A333408
• Numbers k such that A173557(k) = A173557(k+1).at n=14A333874