A263028 Numbers n such that A002322(n) + 1 is a prime, where A002322 is Carmichael lambda.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 76, 77, 78, 79, 80, 82, 83

Offset

1,2

Comments

Complement of A263029.

Links

Antti Karttunen, Table of n, a(n) for n = 1..39743

Mathematica

Select[Range[1, 100], PrimeQ[CarmichaelLambda[#] + 1] &]

Prog

(Magma) [1] cat [n: n in [2..100] | IsPrime(CarmichaelLambda(n)+1)];
(PARI) for(n=1, 1e3, if(isprime((1 + lcm(znstar(n)[2]))), print1(n", "))) \\ Altug Alkan, Oct 12 2015

Crossrefs

Cf. A002322, A263027, A263029, A296077 (characteristic function).

Cf. also A039698.

Sequence in context: A228144 A236841 A236850 * A044921 A260423 A193989

Adjacent sequences: A263025 A263026 A263027 * A263029 A263030 A263031

Keyword

nonn,easy

Author

Vincenzo Librandi, Oct 12 2015

Extensions

More terms from Antti Karttunen, Dec 05 2017

Status

approved