30377

Appears in sequences

• a(n) = Sum_{k=0..n} T(n,k) * T(n,n+k), with T given by A027023.at n=8A027046
• Numbers k such that 27*2^k-1 is prime.at n=39A050539
• Numbers n such that n'' = n'+1 where n' and n'' are respectively the first and the second arithmetic derivative of n (A003415).at n=9A189639
• Number of ways to place any number of black and any number of white nonattacking knights on a (n+2)X(1+2) board.at n=1A251526
• Number of ways to place any number of black and any number of white nonattacking knights on a (n+2)X(2+2) board.at n=0A251527
• T(n,k)=Number of ways to place any number of black and any number of white nonattacking knights on a (n+2)X(k+2) board.at n=1A251531
• T(n,k)=Number of ways to place any number of black and any number of white nonattacking knights on a (n+2)X(k+2) board.at n=2A251531
• Numbers n such that phi(n) = 3*phi(n+1).at n=9A256907
• Numbers k for which sigma(k) = k + k'', where k'' is the second derivative of k (A068346).at n=10A348426