cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A173871 Row sums of A114994.

Original entry on oeis.org

0, 1, 5, 16, 53, 145, 441, 1165, 3325, 8840, 24268, 63542, 172420, 446485, 1182329, 3055461, 7966038, 20351233, 52507157, 133014971, 339170500, 853849745, 2154442760, 5382418592, 13481157491, 33449252747, 83091028844, 205013093570, 505799029994, 1240477207822, 3042433058325
Offset: 0

Views

Author

Alford Arnold, Mar 05 2010

Keywords

Examples

			A114994 begins:
0;
1; => row sum 1;
2,3; => row sum 5;
4,5,7; => row sum 16;
8,9,10,11,15; => row sum 53.
		

Crossrefs

Programs

  • Maple
    isA114994aux := proc(n) local k; for k from 0 do fk1 := 4^(k+1) ; if 2^k mod fk1 = n mod fk1 then return true; elif (2^k mod fk1) > n then return false; end if; end do: end proc:
    isA114994 := proc(n) option remember ; if n = 0 then return true; elif type(n,'odd') then if n <= 11 then true; else return procname((n-1)/2) ; fi; else return ( isA114994(n/2) and isA114994aux(n/2) ); end if; end proc:
    A173871 := proc(n) a := 0 ; for k from 2^n to 2^(n+1)-1 do if isA114994(k) then a := a+k; end if; end do; a ; end proc:
    seq(A173871(n),n=0..19) ; # R. J. Mathar, Mar 26 2010

Extensions

a(9)-a(19) from R. J. Mathar, Mar 26 2010
a(0) prepended by and more terms from Jinyuan Wang, Feb 23 2020
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