35143

Appears in sequences

• Semiprimes whose prime factors are distinct and the reversal of one factor is equal to the other.at n=4A083815
• Combining the conditional divide-by-two concept from Collatz sequences with Pascal's triangle, we can arrive at a new kind of triangle. Start with an initial row of just 4. To compute subsequent rows, start by appending a zero to the beginning and end of the previous row. Like Pascal's triangle, add adjacent terms of the previous row to create each of the subsequent terms. The only change is that each term is divided by two if it is even. Then take the center of this triangle. In other words, take the n-th term from the (2n)th row.at n=21A123403
• Product of n-th prime and n-th prime written backwards.at n=29A133019
• Numbers whose square is the product of a number and its reverse.at n=16A207373
• Non-palindromes numbers not ending in 0 whose square is the product of a number and its reverse in only one way.at n=8A325151
• Number of separable partitions of n in which the number of distinct (repeatable) parts is > 4.at n=42A325719
• Semiprimes whose prime factors are the digit reversal of each other.at n=13A376746