31003

Appears in sequences

• Expansion of 1/((1-3x)(1-4x)(1-6x)(1-8x)).at n=4A028033
• Quasi-Carmichael numbers to base 3: squarefree composites n such that prime p|n ==> p-3|n-3.at n=12A029560
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 13.at n=13A031691
• phi(n) plus the n-th prime gives a cube.at n=9A114085
• Numbers which are the product of a non-palindrome and its reversal, where leading zeros are not allowed.at n=40A129623
• Product of n-th prime and n-th prime written backwards.at n=26A133019
• Numbers whose square is the product of a number and its reverse.at n=14A207373
• Quasi-Carmichael numbers to at least one negative base and at least one positive base.at n=10A257759
• Numbers k with the property that there exists a positive integer multiplier M such that M times the sum of the digits of k, multiplied further by the reversal of this product, gives k.at n=35A305131
• Non-palindromes numbers not ending in 0 whose square is the product of a number and its reverse in only one way.at n=6A325151
• Positive numbers k of the form x*y where k, x and y have the same set of decimal digits.at n=17A330898
• a(n) = Sum_{k=0..floor(n/2)} binomial(k+2,2) * binomial(n,k) * binomial(n-k,k).at n=9A392032