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 A162554 Triples of numbers {n1 < n2 < n3} such that {n1, n2, n3}^2 together use exactly 9 decimals 1..9, sorted first by n1, then by n2, and by n3. 2
 1, 2, 1816, 1, 2, 1964, 1, 2, 2414, 1, 2, 2527, 1, 2, 2927, 1, 2, 3094, 1, 7, 934, 1, 8, 733, 1, 16, 272, 1, 25, 272, 2, 4, 733, 2, 5, 374, 2, 5, 626, 2, 17, 124, 3, 18, 126, 4, 5, 272, 4, 28, 73, 5, 28, 37, 5, 28, 44, 5, 29, 86, 6, 9, 273, 6, 9, 282, 6, 27, 72, 9, 18, 87, 9, 24, 57, 9, 27, 66, 19, 23, 28 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..81. EXAMPLE There are exactly 27 such triples: 1. {1,2,1816}^2={1,4,3297856} 2. {1,2,1964}^2={1,4,3857296} 3. {1,2,2414}^2={1,4,5827396} 4. {1,2,2527}^2={1,4,6385729} 5. {1,2,2927}^2={1,4,8567329} 6. {1,2,3094}^2={1,4,9572836} 7. {1,7,934}^2={1,49,872356} 8. {1,8,733}^2={1,64,537289} 9. {1,16,272}^2={1,256,73984} 10. {1,25,272}^2={1,625,73984} 11. {2,4,733}^2={4,16,537289} 12. {2,5,374}^2={4,25,139876} 13. {2,5,626}^2={4,25,391876} 14. {2,17,124}^2={4,289,15376} 15. {3,18,126}^2={9,324,15876} 16. {4,5,272}^2={16,25,73984} 17. {4,28,73}^2={16,784,5329} 18. {5,28,37}^2={25,784,1369} 19. {5,28,44}^2={25,784,1936} 20. {5,29,86}^2={25,841,7396} 21. {6,9,273}^2={36,81,74529} 22. {6,9,282}^2={36,81,79524} 23. {6,27,72}^2={36,729,5184} 24. {9,18,87}^2={81,324,7569} 25. {9,24,57}^2={81,576,3249} 26. {9,27,66}^2={81,729,4356} 27. {19,23,28}^2={361,529,784}. CROSSREFS Cf. A162450, A162839. Sequence in context: A080642 A108331 A263076 * A167840 A113917 A259487 Adjacent sequences: A162551 A162552 A162553 * A162555 A162556 A162557 KEYWORD fini,full,nonn,base AUTHOR Zak Seidov, Jul 06 2009 EXTENSIONS Edited by Ray Chandler, Jul 14 2009 STATUS approved

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Last modified April 23 07:57 EDT 2024. Contains 371905 sequences. (Running on oeis4.)