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 A265079 Numbers n such that the Crandall number C = A262961(n) has exactly one prime divisor p >= n/2. 2
 3, 5, 7, 9, 11, 33, 36, 49, 453, 727, 1560, 1569, 1627, 5078, 6605, 17663, 27281, 29298, 29708, 39509, 98653 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS If a Crandall number C = A262961(n) is an even semiprime, then n is a term of this sequence. - Altug Alkan, Dec 30 2015 LINKS Table of n, a(n) for n=1..21. David Broadhurst, Crandall Memorial Puzzle, Oct 04, 2015. David Broadhurst, Crandall Memorial Puzzle [Cached copy, with permission] David Broadhurst, Crandall memorial puzzle: solution and heuristics David Broadhurst, Crandall memorial puzzle: solution and heuristics [Cached copy, with permission] David Broadhurst, Feynman integrals, L-series and Kloosterman moments, arXiv:1604.03057, 2016. EXAMPLE 5 is a term because A262961(5) = 302 and its prime divisors are 2, 151 and only 151 >= 5/2. CROSSREFS Cf. A262961. Sequence in context: A004156 A081936 A238795 * A092361 A029950 A372149 Adjacent sequences: A265076 A265077 A265078 * A265080 A265081 A265082 KEYWORD nonn,more AUTHOR N. J. A. Sloane, Dec 30 2015 STATUS approved

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Last modified August 3 08:07 EDT 2024. Contains 374885 sequences. (Running on oeis4.)