Minimal prime (recreational mathematics)
In recreational number theory, a minimal prime is a prime number for which there is no shorter subsequence of its digits in a given base that form a prime. In base 10 there are exactly 26 minimal primes: 2, 3, 5, 7, 11, 19, 41, 61, 89, 409, 449, 499, 881, 991, 6469, 6949, 9001, 9049, 9649, 9949, 60649, 666649, 946669, 60000049, 66000049, 66600049 (sequence in the OEIS). Similarly, there are exactly 32 composite numbers which have no shorter composite subsequence: There are 146 primes congruent to 1 mod 4 which have no shorter prime congruent to 1 mod 4 subsequence:
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Minimal prime (recreational mathematics)
In recreational number theory, a minimal prime is a prime number for which there is no shorter subsequence of its digits in a given base that form a prime. In base 10 there are exactly 26 minimal primes: 2, 3, 5, 7, 11, 19, 41, 61, 89, 409, 449, 499, 881, 991, 6469, 6949, 9001, 9049, 9649, 9949, 60649, 666649, 946669, 60000049, 66000049, 66600049 (sequence in the OEIS). Similarly, there are exactly 32 composite numbers which have no shorter composite subsequence: There are 146 primes congruent to 1 mod 4 which have no shorter prime congruent to 1 mod 4 subsequence:
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En théorie des nombres récréat ...... 901, 9949, ... suite de l'OEIS
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In der Unterhaltungsmathematik ...... nicht miteinander vertauscht.
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In recreational number theory, ...... 51, ... (sequence in the OEIS)
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極小質數（英語：minimal prime）是娛樂數學中的一 ...... 371, 711, 713, 731 （OEIS中的数列）
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En théorie des nombres récréat ...... s-suite composée plus courte :
@fr
In der Unterhaltungsmathematik ...... nicht miteinander vertauscht.
@de
In recreational number theory, ...... gruent to 1 mod 4 subsequence:
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極小質數（英語：minimal prime）是娛樂數學中的一 ...... 在數字順序不變下，所有子序列（除該合數本身以外）都不是合數：
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Minimal prime (recreational mathematics)
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Minimale Primzahl
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Nombre premier minimal
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極小質數
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