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A162002 Numbers n for which 2^^n == 2^2^n (mod n); for the "^^" notation see A092188. 2
1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 15, 16, 17, 18, 20, 24, 26, 28, 30, 32, 34, 36, 40, 42, 43, 44, 46, 48, 51, 52, 56, 58, 60, 64, 68, 70, 72, 76, 78, 80, 84, 85, 88, 90, 96, 100, 102, 104, 112, 120, 124, 126, 127, 128, 130, 132, 136, 140, 141, 144, 145, 148, 156, 160, 164 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..65.

Robert Munafo, 2^^N == 2^(2^N) mod N

EXAMPLE

3 is in the sequence because 2^2^3 = 2^8 = 256 == 1 mod 3, and 2^^3 = 2^2^2 = 2^4 = 16 == 1 mod 3.

CROSSREFS

Cf. A092188, A162018, A014221

Sequence in context: A173643 A120722 A090811 * A182764 A273011 A032956

Adjacent sequences:  A161999 A162000 A162001 * A162003 A162004 A162005

KEYWORD

easy,nonn

AUTHOR

Robert Munafo, Jun 24 2009

STATUS

approved

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Last modified March 24 22:01 EDT 2017. Contains 284016 sequences.