23130

Appears in sequences

• Numbers whose base-4 representation contains exactly four 1's and four 2's.at n=9A045109
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,7.at n=23A064240
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,21.at n=30A064247
• List of codewords in binary lexicode with Hamming distance 8 written as decimal numbers.at n=10A075940
• a(n) = 729*n - 198.at n=31A156772
• The A161671(n)-th partial sum of A161671.at n=38A161778
• Triangle interpolating the swinging factorial (A056040) restricted to odd indices with its binomial inverse. Triangle read by rows. For n >= 0, k >= 0.at n=32A163772
• Base-10 representation of numbers k which, in base 2, satisfy abs(k + reverse(k) - reverse(k + reverse(k))) = abs(k - reverse(k)) + reverse(abs(k - reverse(k))) = k.at n=8A179697
• Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=14A207020
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and 3w+x+y>0.at n=18A211628
• Rows of binary Walsh matrices interpreted as reverse binary numbers.at n=20A228539
• Number of orthogonal rectangles with vertices on an n X n square grid of points but with no vertices on the grid's diagonals.at n=20A285956
• Number of locally disjoint enriched p-trees of weight n.at n=10A331687
• Number of regions in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and three equally spaced points along the diameter (a total of n+3 points). See Comments for precise definition.at n=25A333642