54947

Appears in sequences

• Number of proper factorizations of p1^n*p2^3, where p1 and p2 are distinct primes.at n=23A031126
• Number of solutions to triples version of Langford (or Langford-Skolem) problem.at n=17A059107
• a(n) = (1/n!)*A001565(n).at n=37A094792
• Counterexamples to the conjecture that an even, prime-indexed triangular plus 1 equals a prime or that an odd, prime-indexed triangular minus 2 equals a prime.at n=26A097785