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 A124402 Numbers k such that 3^k mod 2^k < 3^(k-1) mod 2^(k-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 indices k such that A002380(k) < A002380(k-1). LINKS EXAMPLE 1 == 3^4 (mod 2^4) which is less than 3 == 3^3 (mod 2^3) so 4 is a term. 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: A340600 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 June 16 21:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)