A178389 Multiples of 3 in A175461.

21, 69, 93, 141, 213, 237, 309, 381, 453, 501, 573, 597, 669, 717, 789, 813, 933, 1077, 1101, 1149, 1293, 1317, 1389, 1437, 1461, 1509, 1797, 1821, 1893, 1941, 2157, 2181, 2229, 2253, 2469, 2517, 2589, 2661, 2733, 2757, 2901, 2949, 2973, 3093, 3117, 3189

Offset: 1

Author

Zak Seidov, May 27 2010

Keywords

• nonn

Crossrefs

Cf. A175461.

Formula

a(n) = 3*A007522(n). [From R. J. Mathar, May 31 2010]