40653

Appears in sequences

• The n-th highly composite number equals the a(n)-th composite number, for n >= 3.at n=25A074329
• Numbers n such that n*359# +-1 are twin primes, where 359# = 72nd primorial (A002110(72)).at n=31A087907
• Records in A110030.at n=17A110031
• Number of (n+1)X(n+1) -11..11 symmetric matrices with every 2X2 subblock having sum zero and one, two or three distinct values.at n=6A211714
• Number of nX3 nonnegative integer arrays with upper left 0 and lower right n+3-4 and value increasing by 0 or 1 with every step right or down.at n=12A252871
• Odd composites k such that sigma(k) has the same powerful part as k, where sigma is the sum of divisors function.at n=34A386425