a(n+1) = a(n) + floor(a(n)/7) with a(0) = 7.

Terms

a(0) =7a(1) =8a(2) =9a(3) =10a(4) =11a(5) =12a(6) =13a(7) =14a(8) =16a(9) =18a(10) =20a(11) =22a(12) =25a(13) =28a(14) =32a(15) =36a(16) =41a(17) =46a(18) =52a(19) =59a(20) =67a(21) =76a(22) =86a(23) =98a(24) =112a(25) =128a(26) =146a(27) =166a(28) =189a(29) =216