This number is a composite.
π(437) = 4*3*7. [Kumar]
The smallest tetranacci brilliant number (437 = 19 × 23) defined by the four prime digits (T0=2, T1=3, T2=5, T3=7) and the recurrence relation: Tn = Tn-1 + Tn-2 + Tn-3 + Tn-4. [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell