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A309706 Smallest number that contains the first n primes as substrings in base 10. Substrings go from left to right, but numbers in the substrings can be separated by several numbers. 0

%I #35 Dec 08 2019 02:09:38

%S 2,23,235,2357,112357,112357,112357,1123579,1123579,1123579,1231579,

%T 1231579,12341579,12431579,12431579,12453179,12453179,124536179,

%U 124536179,1124536719,1234567139,1234567139,12345671839,12345671839,12456783197,102456783197,102456783197,102456783197

%N Smallest number that contains the first n primes as substrings in base 10. Substrings go from left to right, but numbers in the substrings can be separated by several numbers.

%C The version with subsequences of contiguous numbers is A054261.

%C The sequence is nondecreasing, by definition.

%F a(n) <= A054261(n). - _David A. Corneth_, Aug 28 2019

%e The series starts as A054261, but 112357 is followed by 112357 because 13 can be obtained with a subsequence '1','3' which is interrupted by '2'.

%Y Cf. A054261, A240959.

%K nonn,base

%O 1,1

%A _Vincent Champain_, Aug 28 2019

%E a(11)-a(28) from _David A. Corneth_, Aug 28 2019

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Last modified March 29 08:53 EDT 2024. Contains 371268 sequences. (Running on oeis4.)