A093906 Start with {2} and close under the operations XY and XY+1; sequence gives complete list of numbers that do not appear.

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

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

Table of n, a(n) for n=1..96.

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,changed

Author

Franklin T. Adams-Watters, May 25 2004

Extensions

Corrected by Don Reble, May 25 2004

Status

approved