A213307 Minimal prime with n nonprime substrings (Version 3: substrings with leading zeros are counted as nonprime if the corresponding number is not a prime).

2, 13, 11, 127, 101, 149, 1009, 1063, 1049, 1481, 10091, 10069, 10169, 11681, 14669, 100129, 100189, 100169, 101681, 104681, 146669, 1000669, 1001219, 1001081, 1004669, 1014469, 1046849, 1468469, 10001081, 10004669, 10010851

Offset

0,1

Links

Hieronymus Fischer, Table of n, a(n) for n = 0..100

Formula

a(n) > 10^floor((sqrt(8*n+1)-1)/2), for n>2.

a(n) >= A213304(n).

a(n) >= A213306(n).

Example

a(0) = 2, since 2 is the least number with zero nonprime substrings.
a(1) = 13, since 13 there is one nonprime substring (=1).
a(2) = 11, since 11 is the least number with 2 nonprime substrings (2 times ‘1’).
a(3) = 127, since 127 is the least number with 3 nonprime substrings, these are 1 and 12 and 27 (according to version 3).

Crossrefs

Cf. A019546, A035232, A039996, A046034, A069489, A085823, A211681, A211682, A211684, A211685.

Cf. A035244, A079307, A213300 - A213321.

Sequence in context: A355896 A213306 A373825 * A213305 A002591 A037055

Adjacent sequences: A213304 A213305 A213306 * A213308 A213309 A213310

Keyword

nonn,base

Author

Hieronymus Fischer, Aug 26 2012

Status

approved