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A171597 a(n) = 0+1+2+...+n in lunar arithmetic in base 7 written in base 10. 0

%I

%S 0,1,2,3,4,5,6,13,13,13,13,13,13,13,20,20,20,20,20,20,20,27,27,27,27,

%T 27,27,27,34,34,34,34,34,34,34,41,41,41,41,41,41,41,48,48,48,48,48,48,

%U 48,97,97,97,97,97,97,97,97,97,97,97,97,97,97,97,97,97,97,97,97,97,97,97

%N a(n) = 0+1+2+...+n in lunar arithmetic in base 7 written in base 10.

%H D. Applegate, M. LeBrun and N. J. A. Sloane, <a href="http://arxiv.org/abs/1107.1130">Dismal Arithmetic</a> [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]

%H <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a>

%K nonn,base

%O 0,3

%A _N. J. A. Sloane_, Oct 02 2010

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Last modified January 18 01:05 EST 2020. Contains 330995 sequences. (Running on oeis4.)