Palindromic primes: Difference between revisions
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(Added Algol 68) |
(→{{header|ALGOL 68}}: Tweak) |
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FOR n TO 9 DO IF prime[ n ] THEN print( ( " ", whole( n, 0 ) ) ) FI OD; |
FOR n TO 9 DO IF prime[ n ] THEN print( ( " ", whole( n, 0 ) ) ) FI OD; |
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# the only palindromic 2 digit numbers are multiples of 11 # |
# the only palindromic 2 digit numbers are multiples of 11 # |
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# so 11 is the only 2 digit palindromic prime # |
# so 11 is the only possible 2 digit palindromic prime # |
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print( ( " 11" ) ); |
IF prime[ 11 ] THEN print( ( " 11" ) ) FI; |
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# three digit numbers, the first and last digits must be odd # |
# three digit numbers, the first and last digits must be odd # |
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# and cannot be 5 (as the number would be divisible by 5) # |
# and cannot be 5 (as the number would be divisible by 5) # |
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