21949

Appears in sequences

• Multiplicity of highest weight (or singular) vectors associated with character chi_142 of Monster module.at n=39A034530
• Composite and every divisor (except 1) contains the digit 4.at n=16A062670
• Heptagonal numbers for which the digital root is also a heptagonal number.at n=43A117663
• Number of partitions of n such that m(2) > m(3), where m = multiplicity.at n=41A240065
• Heptagonal numbers (A000566) that are semiprimes (A001358).at n=17A259676
• Number of nX4 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=5A302666
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=41A302670
• Number of 6Xn 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=3A302672
• Semiprimes k such that k+4, k+6, k+9, k+10 and k+14 are also semiprimes.at n=5A360666
• Numbers k such that k + 4, k + 6, k + 9, k + 10, and k + 14 are all semiprimes, where 4, 6, 9, 10, 14 are the first 5 semiprimes.at n=20A365240