18809

Appears in sequences

• Numbers k whose decimal representation, read as a base-19 value and divided by k, yields an integer.at n=12A032569
• Numbers k > 1 such that k mod ord2(k) is even, where ord2(k) is the order of 2 mod k.at n=28A036260
• Number of one-element transitions from the partitions of n to the partitions of n+1 for labeled parts.at n=25A093694
• Number of 0..6 arrays x(0..n-1) of n elements with zero n-1st difference.at n=7A200152
• Number of n X 2 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=29A241050
• Expansion of 1/(1 - Sum_{k>=1} mu(k)^2*x^k), where mu(k) is the Moebius function (A008683).at n=16A280194
• Numbers k such that 413*2^k+1 is prime.at n=20A323106
• Number of compositions of n with strictly decreasing first quotients.at n=49A342494