71381

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 21.at n=26A031609
• Multiplicity of highest weight (or singular) vectors associated with character chi_94 of Monster module.at n=42A034482
• Second differences of sequence A160644.at n=47A160648
• Semiprimes p such that next semiprime after p is p+20.at n=19A217335