A079257 a(n) is taken to be the smallest positive integer greater than a(n-1) which is consistent with the condition "n is a member of the sequence if and only if a(n) is a triangular number".

0, 1, 4, 5, 6, 10, 15, 16, 17, 18, 21, 22, 23, 24, 25, 28, 36, 45, 55, 56, 57, 66, 78, 91, 105, 120, 121, 122, 136, 137, 138, 139, 140, 141, 142, 143, 153, 154, 155, 156, 157, 158, 159, 160, 161, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 190, 210, 231

Offset

0,3

Links

Table of n, a(n) for n=0..57.

B. Cloitre, N. J. A. Sloane and M. J. Vandermast, Numerical analogues of Aronson's sequence, J. Integer Seqs., Vol. 6 (2003), #03.2.2.

B. Cloitre, N. J. A. Sloane and M. J. Vandermast, Numerical analogues of Aronson's sequence (math.NT/0305308)

Crossrefs

See A079000, A079253, A079254, A079256, A079258 for similar sequences.

Sequence in context: A310570 A271146 A347806 * A001609 A101590 A057916

Adjacent sequences: A079254 A079255 A079256 * A079258 A079259 A079260

Keyword

nonn,easy

Author

N. J. A. Sloane and Matthew Vandermast, Feb 04 2003

Status

approved