OFFSET
1,1
COMMENTS
Primes that become composite if any digit is removed, changed, or inserted anywhere. First & smallest term found by Jens K. Andersen in 2008; five more by Giovanni Resta in Nov. 2011. Expected infinite of them. These primes emerge in relation to the prime-version of classical Doublets puzzle by Lewis Carrol. Correspond to the "aloof" words as named by Donald Knuth.
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..50
G. L. Honaker, Jr. and C. K. Caldwell, Prime Curios! 40144044691
Wikipedia, Word ladder
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Carlos Rivera, Nov 06 2011
EXTENSIONS
More terms from Giovanni Resta, Aug 15 2019
STATUS
approved