142121

Appears in sequences

• a(n) = n base 5, under morphism f(1) = 121, f(2) = 123, f(3) = 141, f(4) = 142, or 0 if n base 5 has a zero.at n=20A137850
• Number of 5-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero.at n=15A208599
• The growth series for the affine Weyl group E_7.at n=16A266785