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A124402 Numbers n such that mod(3^n,2^n) is less than mod(3^(n-1),2^(n-1)). 0
4, 7, 17, 20, 24, 27, 29, 40, 45, 48, 49, 53, 55, 57, 61, 62, 65, 67, 72, 76, 79, 82, 83, 85, 88, 91, 95, 100, 101, 106, 107, 109, 112, 119, 124, 136, 139, 142, 149, 151, 153, 158, 159, 164, 165, 167, 171, 178, 186, 189, 193, 197, 198, 202, 204, 209, 210, 215, 219 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also positions where A002380(n) < A002380(n-1).

The first occurrence of k in the first forward difference: 48, 27, 4, 20, 40, 358, 112, 178, 222, 7, ...,.

LINKS

Table of n, a(n) for n=1..59.

EXAMPLE

1 == 3^4 (mod 2^4) which is less than 3 == 3^3 (mod 2^3) so 4 is a member.

MATHEMATICA

pm = 0; lst = {}; Do[pn = PowerMod[3, n, 2^n]; If[pn < pm, AppendTo[lst, n]]; pm = pn, {n, 221}]; lst

CROSSREFS

Cf. A002380.

Sequence in context: A246915 A013625 A182929 * A216552 A034736 A236564

Adjacent sequences:  A124399 A124400 A124401 * A124403 A124404 A124405

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Dec 14 2006

STATUS

approved

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Last modified October 17 04:09 EDT 2019. Contains 328106 sequences. (Running on oeis4.)