31133

Appears in sequences

• Matrices with 2 rows.at n=7A002136
• Replace n with concatenation of its divisors >1.at n=32A037277
• Replace n with concatenation of its odd divisors >1.at n=32A037284
• Replace n with concatenation of its nontrivial odd divisors.at n=65A037285
• Replace 2n+1 with concatenation of its divisors >1.at n=16A037287
• Smallest multiple of (n+1)-st prime which is == 1 mod n-th prime.at n=41A073604
• Numbers starting with 1 such that the sum of any two distinct elements has an odd number of distinct prime factors.at n=15A180615
• Floor-Sqrt transform of Lucas numbers (A000032).at n=43A192660
• List of primitive words over the alphabet {1,3}.at n=40A213970
• Maximal nonempty {1,3}-chunks of a 4-day-old string in a "Look and Say" sequence.at n=25A244047
• Triangle read by rows: Cayley's numbers phi(m,n) (m,n>=0). Row m contains phi(m,0), phi(m-1,1), phi(m-2,2), ..., phi(0,m).at n=37A260338
• Numbers such that the sum of the reverse of their aliquot parts is equal to the reverse of the sum of their aliquot parts.at n=40A278948
• Replacing each digit d in decimal expansion of n with d^2 yields a prime at each step when done recursively three times.at n=28A316604
• Number of length n word structures using an infinite alphabet with all distinct run-lengths and the first run length of a symbol less than that of previous symbols.at n=26A351732