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 A264482 Triangle T(n,k) (1 <= k <= n) read by rows: row n lists the set of n coprime numbers that minimizes the difference between first and last terms, and then minimizes the average of the terms. 5
 1, 1, 2, 1, 2, 3, 1, 2, 3, 5, 1, 2, 3, 5, 7, 5, 7, 8, 9, 11, 13, 1, 2, 3, 5, 7, 11, 13, 5, 7, 8, 9, 11, 13, 17, 19, 1, 2, 3, 5, 7, 11, 13, 17, 19, 11, 13, 16, 17, 19, 21, 23, 25, 29, 31, 7, 8, 9, 11, 13, 17, 19, 23, 25, 29, 31, 1, 2, 3, 5, 7, 11, 13, 17, 19 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS The minimal set of the (k+n)th row is determined by the minimal k-tuple coprime to the n-th primorial, where every prime <= the n-th prime must be a factor of some number in the set. E.g., the sixth row must consist of numbers congruent to 5, 7, 11 and 13 mod 6, as well as one term with a factor of 2 and another with a factor of 3. In cases where multiple k-tuples satisfy the definition, the lexicographically earliest solution is chosen. Are there infinitely many rows that start with 1? LINKS Max Barrentine, Table of n, a(n) for n = 1..1081, rows 1..46. EXAMPLE 1; 1, 2; 1, 2, 3; 1, 2, 3, 5; 1, 2, 3, 5, 7; 5, 7, 8, 9, 11, 13; ... CROSSREFS Cf. A260652. Sequence in context: A119444 A060040 A092080 * A193588 A165884 A263939 Adjacent sequences:  A264479 A264480 A264481 * A264483 A264484 A264485 KEYWORD nonn,tabl AUTHOR Max Barrentine, Nov 14 2015 EXTENSIONS b-file corrected and extended by Max Barrentine, Jun 23 2016 STATUS approved

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Last modified September 29 20:22 EDT 2020. Contains 337432 sequences. (Running on oeis4.)