75809

Appears in sequences

• a(1) = 0, a(2) = 0; for n > 2, a(n) - a(n-3) - a(n-5) - ... - a(n-p) = n if n is prime, otherwise = 0, where p = largest prime < n.at n=42A002123
• Products p^3 or p^2*q, where {p,q} are consecutive primes.at n=38A033477
• a(n) = (2*n-1)*(2*n+1)^2.at n=20A102094
• a(n) = n*(n+2)^2.at n=41A152619
• a(n) = smallest number k with property that if the base-n expansion of k is reversed, the result is a nontrivial multiple of k.at n=39A224220
• Numbers k such that k and k+1 are both divisible by the square of their largest prime factor.at n=26A354558
• The smallest nonpalindromic number in base n that shares the same prime divisors as its digit reversal in base n.at n=40A371307