A061445 Composite numbers n such that primitive part of Lucas(n) (see A061447) is prime.

9, 10, 14, 15, 16, 20, 21, 26, 27, 30, 33, 36, 38, 49, 56, 62, 66, 68, 70, 72, 76, 78, 80, 86, 90, 91, 110, 117, 120, 121, 136, 140, 144, 164, 168, 172, 178, 202, 207, 220, 261, 284, 328, 354, 357, 420, 423, 458, 459, 468, 480, 504, 513, 530, 586, 606

Offset: 1

Author

David Broadhurst, Jun 10 2001

Keywords

• nonn

Examples

			16 is a term because A061447(16)=2207 is a prime. - _Sean A. Irvine_, Feb 15 2023
		

Links

• David Broadhurst, Table of n, a(n) for n = 1..258 yielding primes or probable primes
• J. Brillhart, P. L. Montgomery and R. D. Silverman, Tables of Fibonacci and Lucas factorizations, Math. Comp. 50 (1988), 251-260, S1-S15. Math. Rev. 89h:11002.
• C. K. Caldwell, Lucas Aurifeuillian primitive part

Crossrefs

Cf. A061446, A061447, A061254, A061442, A061443.

Extensions

Definition corrected by T. D. Noe, Dec 14 2006

Missing a(5)=16 inserted by Sean A. Irvine, Feb 15 2023