OFFSET
1,2
COMMENTS
Gilbreath's triangle is a triangle of numbers arising from Gilbreath's conjecture: successive absolute differences of primes.
FORMULA
a(n) = A173816(n)/2.
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
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Feb 25 2010
EXTENSIONS
a(23) and a(24) corrected and sequence extended by R. J. Mathar, Mar 01 2010
STATUS
approved