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 A183071 Positive integers k such that each prime divisor of 2^k - 1 has the form 4j + 3. 8
 1, 2, 3, 5, 6, 7, 10, 13, 14, 15, 17, 19, 26, 30, 31, 34, 38, 43, 51, 61, 62, 65, 79, 85, 86, 89, 93, 95, 107, 122, 127, 129, 130, 133, 158, 170, 193, 254, 255, 301, 311, 331, 349, 389, 445, 521, 557, 577, 579, 607, 631, 647, 1103, 1167 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The exponents of the Mersenne primes (A000043) are contained in this sequence. Needed factorizations are in the Cunningham Project. LINKS S. S. Wagstaff, Jr., The Cunningham Project. FORMULA A183075(n) = 2^a(n) - 1. EXAMPLE 6 is in this sequence because 2^6 - 1 = 3^2 * 7, and 3 and 7 have the form 4j + 3. CROSSREFS Cf. A000043, A136003, A183072, A183073, A183074. Cf. A000668, A136005, A183075, A183076, A183077, A183078. Sequence in context: A101323 A298705 A030051 * A139826 A182048 A028722 Adjacent sequences:  A183068 A183069 A183070 * A183072 A183073 A183074 KEYWORD nonn AUTHOR Stuart Clary, Dec 23 2010 EXTENSIONS a(53)-a(54) from Amiram Eldar, Feb 18 2019 STATUS approved

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Last modified October 19 16:17 EDT 2019. Contains 328223 sequences. (Running on oeis4.)