319507

Appears in sequences

• Odd composite numbers k for which k = A140607((k-1)/2).at n=10A140667
• Overpseudoprimes to base 5.at n=17A141390
• Composite numbers k == 3, 7 (mod 10) such that 5^((k-1)/2) == -1 (mod k).at n=5A375916