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 A178400 Sums of two primes, an array by antidiagonals. 1
 4, 5, 5, 6, 7, 7, 8, 8, 9, 9, 10, 10, 10, 12, 12, 13, 13, 14, 14, 14, 15, 15, 16, 16, 16, 16, 18, 18, 18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 22, 22, 22, 22, 22, 24, 24, 24, 24, 24, 24, 25, 25, 26, 26, 26, 26, 26, 28, 28, 28, 28, 30, 30, 30, 30, 30, 30, 31 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The joint-rank array of this array is A178431. LINKS FORMULA T(i,j)=p(i)+p(j), where p=(2,3,5,7,...)=A000040. EXAMPLE Northwest corner: 4....5....7....9...13... 5....6....8...10...12... 7....8...10...12...16... 9...10...12...14...14... T(1,1)=2+2=4. CROSSREFS Cf. A000040, A014092. Sequence in context: A248926 A107575 A205677 * A114458 A205842 A061508 Adjacent sequences:  A178397 A178398 A178399 * A178401 A178402 A178403 KEYWORD nonn,tabl AUTHOR Clark Kimberling, Dec 21 2010 STATUS approved

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Last modified March 24 01:20 EDT 2019. Contains 321444 sequences. (Running on oeis4.)