A173817 The half of sum of the numbers in the n-th row of Gilbreath's triangle (A036262).
1, 2, 4, 5, 10, 10, 13, 13, 16, 20, 25, 27, 28, 26, 31, 33, 44, 42, 47, 52, 48, 54, 52, 60, 64, 68, 64, 67, 68, 77, 108, 94, 102, 95, 106, 100, 103, 106, 105, 106, 115, 110, 127, 120, 131, 122, 143, 159, 149, 148, 156, 149, 151, 155, 165, 162, 167, 174, 175
Offset: 1
Keywords
Programs
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Maple
A036262 := proc(n,k) option remember ; if k = n then ithprime(n) ; else abs(procname(n,k+1)-procname(n-1,k)) ; end if; end proc: A173818 := proc(n) add(A036262(n,k),k=1..n)/2 ; end proc: seq(A173818(n),n=1..90) ; # R. J. Mathar, Mar 01 2010
Formula
a(n) = A173816(n)/2.
Extensions
a(23) and a(24) corrected and sequence extended by R. J. Mathar, Mar 01 2010
Comments