A199428 Extreme weakly prime numbers.

40144044691, 58058453543, 89797181359, 185113489357, 213022025663, 222498988079, 365115312521, 397195264507, 507086259359, 537598896647, 576872778883, 671770400281, 710587610861, 719174481061, 815380174991, 840202011349, 855194972407, 869287849361, 891600776149

Offset: 1

Author

Carlos Rivera, Nov 06 2011

Keywords

• nonn
• base

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
• C. Rivera, The prime puzzles & problems connection, puzzle 612
• Wikipedia, Word ladder

Crossrefs

Cf. A050249.

Extensions

More terms from Giovanni Resta, Aug 15 2019