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

1,1

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

C. Rivera, The prime puzzles & problems connection, puzzle 612

Wikipedia, Word ladder

Crossrefs

Cf. A050249.

Sequence in context: A216018 A256842 A225886 * A287261 A172631 A172721

Adjacent sequences: A199425 A199426 A199427 * A199429 A199430 A199431

Keyword

nonn,base

Author

Carlos Rivera, Nov 06 2011

Extensions

More terms from Giovanni Resta, Aug 15 2019

Status

approved