Sum of two adjacent numbers are primes: Difference between revisions

=={{header|J}}==

Here, we generate the first 20 odd primes, divide by 2, drop the fractional part and add 0 and 1 to that value. Then we format that pair of numbers with their sum and with decorations indicating the relevant arithmetic:

<lang J> (+/,&":'=',{.,&":'+',&":{:)"#. 0 1+/~<.@-: p:1+i.20

3=1+2

5=2+3

7=3+4

11=5+6

13=6+7

17=8+9

19=9+10

23=11+12

29=14+15

31=15+16

37=18+19

41=20+21

43=21+22

47=23+24

53=26+27

59=29+30

61=30+31

67=33+34

71=35+36

73=36+37</lang>