

A275659


The nonprime digits in the sequence appear in blocks and the successive sizes of these blocks are given by the sequence itself.


2



1, 2, 3, 4, 6, 5, 7, 8, 9, 12, 10, 11, 20, 14, 16, 13, 18, 19, 15, 21, 40, 41, 44, 22, 23, 24, 46, 48, 49, 17, 25, 26, 60, 61, 64, 66, 27, 28, 68, 69, 80, 81, 84, 42, 29, 86, 88, 89, 90, 43, 30, 91, 94, 96, 98, 99, 31, 100, 101, 104, 106, 108, 109, 45, 32, 33, 34, 110, 111, 114, 116, 47, 35, 36, 118, 119, 140, 141, 144, 37, 38, 146
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OFFSET

1,2


COMMENTS

The sequence is started with a(1)=1 and always extended with the smallest integer not yet present that does not lead to a contradiction.


LINKS

Eric Angelini, Table of n, a(n) for n = 1..1001


EXAMPLE

The blocks of nonprime digits are indicated hereunder by parentheses; the successive blocksizes are 1, 2, 3, 4, 6, 5, ... which reproduces the sequence itself: (1),2,3,(4,6),5,7,(8,9,1)2,(10,11),2(0,14,16,1)3,(18,19,1)5,...


CROSSREFS

Sequence in context: A073284 A057511 A121730 * A244321 A062894 A129606
Adjacent sequences: A275656 A275657 A275658 * A275660 A275661 A275662


KEYWORD

nonn,base


AUTHOR

Eric Angelini and Lars Blomberg, Aug 04 2016


STATUS

approved



