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A263028 Numbers n such that A002322(n) + 1 is a prime, where A002322 is Carmichael lambda. 6
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 19 16:08 EDT 2019. Contains 328223 sequences. (Running on oeis4.)