21494

Appears in sequences

• Numbers k such that k, k+1, k+2 and k+3 have the same number of divisors.at n=29A006601
• Numbers k such that k through k+4 all have the same number of divisors.at n=4A049051
• Numbers n such that 117*2^n-1 is prime.at n=42A050584
• Numbers k such that the sum of the digits of k^sigma(k) is divisible by k.at n=20A109658
• Upper Beatty array of the golden ratio, (1+sqrt(5))/2.at n=37A181661
• Maximum total Hamming distance between pairs of consecutive elements in any permutation of all 2^n binary words of length n.at n=10A271771
• Number of n X 2 0..1 arrays with each 1 adjacent to 2, 3 or 4 king-move neighboring 1s.at n=8A296821
• T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 2, 3 or 4 king-move neighboring 1s.at n=46A296827
• Numbers k such that k and k-1 both first appear in the same power of 2 (in base 10).at n=49A322919
• Consecutive states of the linear congruential pseudo-random number generator (1291*s + 4621) mod 21870 when started at s=1.at n=13A385337