gematria.php

<?php

$closest = ['zero', 26 + 5 + 18 + 15];

$numbers = [
	'one',
	'two',
	'three',
	'four',
	'five',
	'six',
	'seven',
	'eight',
	'nine',
	'ten',
	'eleven',
	'twelve',
	'thirteen',
	'fourteen',
	'fifteen',
	'sixteen',
	'seventeen',
	'eighteen',
	'nineteen',
];
$tens = [
	'twenty',
	'thirty',
	'forty',
	'fifty',
	'sixty',
	'seventy',
	'eighty',
	'ninety'
];
foreach ($tens as $ten) {
	$numbers[] = $ten;
	for ($i = 0; $i < 9; $i++) {
		$numbers[] = $ten.'-'.$numbers[$i];
	}
}
for ($i = 0; $i < 9; $i++) {
	$numbers[] = $numbers[$i].'-hundred';
	for ($j = 0; $j < 99; $j++) {
		$numbers[] = $numbers[$i].'-hundred-'.$numbers[$j];
	}
}
foreach($numbers as $i => $name) {
	test_number($i + 1, $name);
}
function test_number(int $number, string $name) {
	global $closest;
	$name = str_replace('-', '', $name);
	$gematria = 0;
	foreach(str_split($name) as $a)
		$gematria += ord($a) - 96;
	echo $number.' ≠ '.$gematria."\n";
	if ($number == $gematria) {
		echo $name.' = '.$gematria."\n";
		exit;
	}
	else if (abs($number - $gematria) < $closest[1])
		$closest = [$name, abs($number - $gematria)];
}
// for ($i = 0; $i < 999; $i++) {
// 	test_number(($i + 1) * 1000, $numbers[$i].'-thousand');
// 	for ($j = 0; $j < 999; $j++) {
// 		test_number(($i + 1) * 1000 + $j + 1, $numbers[$i].'-thousand-'.$numbers[$j]);
// 	}
// }
// for ($i = 0; $i < 999; $i++) {
// 	test_number(($i + 1) * 1000000, $numbers[$i].'-million');
// 	for ($j = 0; $j < 999; $j++) {
// 		for ($k = 0; $k < 999; $k++) {
// 			test_number(($i + 1) * 1000000 + ($j + 1) * 1000 + $k + 1, $numbers[$i].'-million-'.$numbers[$j].'-thousand-'.$numbers[$k]);
// 		}
// 		$numbers[] = $numbers[$i].'-million-'.$numbers[$j];
// 	}
// }

print_r($closest);

?>

No number matches itself, at least by the usual way of writing them.

Two numbers are one off though: 219 & 253

If you include "and", two hundred and fifty-one is the smallest match.