1,2

These Lucas numbers L(n) have no prime factors congruent to 3 (mod 7) or 5 (mod 7) or 6 (mod 7) to an odd power. Also the power of 2 is not 1.

V. Raman, Table of n, a(n) for n = 1..82

Blair Kelly, Factorizations of Fibonacci and Lucas numbers

Sequence in context: A239547 A060728 A295988 * A101761 A035359 A325410

Adjacent sequences: A216430 A216431 A216432 * A216434 A216435 A216436

nonn

V. Raman, Sep 08 2012

approved