30468

Appears in sequences

• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,9.at n=25A064241
• Number of permutations of length n which avoid the patterns 4213 and 3421.at n=9A165539
• Number of (strictly) 3-connected cubic graphs on 2n nodes.at n=8A204198
• Number of (w,x,y) with all terms in {0,...,n} and 2*|w-x| > max(w,x,y) - min(w,x,y).at n=35A213045
• Numbers k such that phi(k-6) = phi(k) = phi(k+6).at n=30A217006
• Unique integers appearing in A066135, in order of appearance.at n=28A218860
• Least positive integer k such that k and k*n are terms of A259539.at n=19A259540
• Number of n X n 0..1 arrays with every element unequal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero.at n=7A304003
• a(n) = (3 + 2*n - 3*n^2 + 4*n^3 - 3*((-1 + n) mod 2))/6.at n=35A304487