document.write( "Question 1106920: The sum of all the prime numbers between 1 and 100 that are simultaneously 1 greater than a multiple of 4 and 1 less than a multiple of 5 \n" ); document.write( "
Algebra.Com's Answer #721933 by greenestamps(13200)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "A number that is 1 less than a multiple of 5 has final digit 4 or 9. \n" ); document.write( "No prime numbers have final digit 4, so the numbers we are looking for have final digit 9. \n" ); document.write( "Prime numbers less than 100 with final digit 9 are 19, 29, 59, 79, and 89. \n" ); document.write( "Of those, the ones that are 1 more than a multiple of 4 are 29 and 89. \n" ); document.write( "The sum of those is 29+89 = 118. \n" ); document.write( " |