102545

Appears in sequences

• Numbers k such that k-1 and k+1 are each the product of exactly 7 primes, counted with multiplicity.at n=32A157487
• a(n) = 1 - 2*n^2 + 4*n*(1 + 2*n^2)/3.at n=34A168547
• Number of nX6 binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.at n=3A269073
• T(n,k)=Number of nXk binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.at n=39A269075
• Number of 4 X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.at n=5A269078
• Semiprimes k such that k+2 and k+6 are primes and k+4 and k+8 are all semiprimes.at n=28A392186