A084335 a(1) = 1; a(n+1) is the least composite number m not already used such that |m-a(n)| is not equal to |a(k+1)-a(k)| for any k < n.

4, 6, 9, 8, 12, 18, 10, 15, 22, 32, 14, 25, 16, 28, 42, 20, 33, 48, 21, 38, 54, 24, 44, 63, 26, 49, 70, 27, 51, 76, 30, 56, 84, 34, 65, 36, 68, 35, 69, 104, 39, 75, 114, 40, 78, 118, 45, 86, 128, 46, 90, 135, 50, 98, 145, 52, 105, 154, 55, 106, 158, 57, 111, 166, 58, 115

Offset: 1

Author

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 18 2003

Keywords

• nonn
• easy

Crossrefs

Cf. A081145, A084331, A084334.

Extensions

Edited and extended by David Wasserman, Dec 15 2004