A218128 a(n) = (A090801(n+2) - 2)/4.

0, 1, 7, 10, 16, 34, 70, 82, 88, 124, 127, 160, 172, 199, 217, 250, 268, 340, 352, 358, 379, 394, 397, 442, 451, 520, 538, 574, 619, 622, 664, 682, 700, 718, 754, 775, 802, 829, 844, 871, 880, 970, 973, 988, 1027, 1078, 1081, 1117, 1123, 1171, 1240, 1252, 1258

Offset: 0

Author

Paul Curtz, Oct 21 2012

Keywords

• nonn

Comments

a(n) mod 9 appears to be always 1 or 7 (except the first term). Checked for the first 1000 terms.

a(n+2) - a(n+1) = 6, 3, 6, 18, 36, 12, 6, 36, 3, 33, 12, 27,... = (A090801(n+4) - A090801(n+3))/4 are multiples of 3.