30653

Appears in sequences

• a(n) = (n+2)*(n+1)*(n^2 + 7*n - 12)/24.at n=26A014309
• a(1) = 7 then the smallest number such that the forward as well as the reverse n-th partial concatenation is a prime for n>1. (Reverse concatenation is taken term-wise and not digit-wise).at n=30A083994
• Number of (w,x,y,z) with all terms in {1,...,n} and 2w=x+y+z.at n=42A212068
• a(n) = Sum_{k|n} binomial(n-1,k-1).at n=17A271654
• Binary "cubes"; numbers whose binary representation consists of three consecutive identical blocks.at n=28A297405
• Positive numbers k such that -k, -(k + 1), -(k + 2), and -(k + 3) are 4 consecutive negative negabinary-Niven numbers (A331728).at n=12A331825
• Starts of runs of 4 consecutive Gray-code Niven numbers (A344341).at n=30A344344