Given any number, x, it is easy to find a rule based on a polynomial of order 6 such that the first six numbers are as listed in the question and the next is the given number. There are also non-polynomial solutions.
However, the simplest polynomial of order 5 is
Un = (471n5 - 7765n4 + 46980n3 - 126380n2 + 144204 - 43080)/30
would give the next number as 5340.
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3 rows of seven with 3 more rows of seven offset by one to the left or right. You end up with all primes. x x x x x x x =x x x x x x x x x x x x x x =x x x x x x x x x x x x x x =x x x x x x x
Get ready, 5 quinquagintillion in Roman Numerals is:(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((V)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))That is 5 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000 x 1000.It's also the same as 5.0 x 10^153
irregular shape! :D x x x x x x x x x x x x
2 x 1004 x 505 x 408 x 2510 x 202 x 2 x 502 x 5 x 205 x 5 x 82 x 2 x 2 x 252 x 2 x 5 x 102 x 4 x 5 x 52 x 2 x 2 x 5 x 52 x 1004 x 505 x 408 x 2510 x 202 x 2 x 502 x 5 x 205 x 5 x 82 x 2 x 2 x 252 x 2 x 5 x 102 x 4 x 5 x 52 x 2 x 2 x 5 x 5
Ah, that's a big number! In Roman numerals, 9999999 is written as IX CM XC IX. Each letter represents a different value, and when combined, they create this beautiful Roman numeral that tells a story of patience and perseverance. Just like painting a masterpiece, sometimes it takes many small strokes to create something truly magnificent.