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 A093906 Start with {2} and close under the operations XY and XY+1; sequence gives complete list of numbers that do not appear. 0
 1, 3, 6, 7, 12, 13, 14, 15, 24, 27, 28, 29, 30, 31, 48, 49, 54, 57, 58, 59, 60, 61, 62, 63, 97, 98, 108, 109, 114, 117, 118, 119, 120, 123, 124, 127, 194, 197, 217, 218, 219, 228, 229, 237, 238, 239, 240, 241, 246, 247, 248, 249, 389, 394, 434, 439, 457, 458, 479, 482, 492, 493, 497, 498, 499, 788, 789, 878, 879, 917, 959, 984, 985, 986, 994, 997, 998, 1579, 1757, 1758, 1759, 1968, 1971, 1988, 1994, 1997, 3514, 3517, 3518, 3989, 7028, 7034, 7037, 7978, 14074, 28148 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS If we start with {2} and close under the operations XY-1 and XY+1, we get the complement of A014574 (midpoints of twin primes), except for the absence of 1. LINKS CROSSREFS Cf. A009388 and A009293. Sequence in context: A004755 A004760 A186083 * A332812 A152829 A325430 Adjacent sequences:  A093903 A093904 A093905 * A093907 A093908 A093909 KEYWORD nonn,fini,full AUTHOR Franklin T. Adams-Watters, May 25 2004 EXTENSIONS Corrected by Don Reble, May 25, 2004. STATUS approved

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Last modified May 26 12:22 EDT 2020. Contains 334626 sequences. (Running on oeis4.)