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 A125227 A014741(n)/6 for n>2. 2
 1, 3, 7, 9, 21, 27, 49, 57, 63, 81, 147, 171, 189, 219, 243, 301, 343, 399, 441, 513, 567, 657, 729, 889, 903, 1029, 1083, 1197, 1323, 1533, 1539, 1701, 1971, 2107, 2187, 2359, 2401, 2667, 2709, 2793, 3087, 3249, 3591, 3969, 4161, 4401, 4599, 4617, 5103, 5913 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,2 COMMENTS A014741(n) is divisible by 6 for n>2. All powers of 3 are terms. All powers of 7 are terms. The prime divisors of terms of this sequence (for n up to 10^6) in order of their first appearance are 3, 7, 19, 73, 43, 127, 337, 163, 379, 571, 5419, 487, 2593, 439, 1459, 431, 883. The sequence is multiplicative in the sense that if two numbers k and m are terms, then k*m is too. LINKS Amiram Eldar, Table of n, a(n) for n = 3..10000 FORMULA a(n) = A014741(n)/6 = A014945(n-1)/3. - Max Alekseyev, Nov 14 2012 EXAMPLE a(3) = A014741(3)/6 = 6/6 = 1. a(4) = A014741(4)/6 = 18/6 = 3. MATHEMATICA Select[Range[3, 6000], PowerMod[2, #+1, # ]==2&]/6 CROSSREFS Cf. A014741, A000295, A086787. Sequence in context: A056652 A014959 A057233 * A057286 A056745 A057263 Adjacent sequences:  A125224 A125225 A125226 * A125228 A125229 A125230 KEYWORD nonn AUTHOR Alexander Adamchuk, Jan 15 2007 STATUS approved

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Last modified September 28 22:01 EDT 2020. Contains 337417 sequences. (Running on oeis4.)