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You can put this solution on YOUR website!
This is a sequence not a series. A sequence is an ordered list of numbers. A series is a sum of a sequence.
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document.write( "There is not a single answer for \"what is the next number\" in this sequence. A sequence can have multiple rules. As long as the rule makes sense (works) it is valid.
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document.write( "The next number could be 54. The rule that would make the number 54 is \"add three to the first number and 4 to every number after the first number\".
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document.write( "The next number could be 55. The rule that would make the number 55 is \"add the number that equals the tens digit to each number.\" 39 has 3 as the tens digit, so the next number is 39+3 = 42. All the numbers in the 40's have 4 as the tens digit, so add 4 to each one - 42+4 = 46, 46+4 = 50.
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document.write( "50 has 5 in the tens digit. 50+5 = 55.
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document.write( "There may be other valid rules that result in a different next number.