212401

Appears in sequences

• Denominators of continued fraction convergents to sqrt(172).at n=14A041317
• Denominators of continued fraction convergents to sqrt(688).at n=10A042323
• Numbers m such that the factorizations of m..m+5 have the same number of primes (including multiplicities).at n=22A045942
• a(n) = floor((product of first n triangular numbers)/(sum of first n factorials)).at n=10A090902
• Numbers k such that k, k+1, ..., k+5 all have 3 prime factors (counted with multiplicity).at n=21A375239
• Numbers k such that (2^k-1)^k == 1 (mod (2^k+1)*k^2) and 2^(k-1) != 1 (mod k).at n=6A384148