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A199428
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Extreme weakly prime numbers.
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1
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40144044691, 58058453543, 89797181359, 185113489357, 213022025663, 222498988079, 365115312521, 397195264507, 507086259359, 537598896647, 576872778883, 671770400281, 710587610861, 719174481061, 815380174991, 840202011349, 855194972407, 869287849361, 891600776149
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listen;
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OFFSET
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1,1
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COMMENTS
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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.
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LINKS
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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
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CROSSREFS
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Cf. A050249.
Sequence in context: A216018 A256842 A225886 * A287261 A172631 A172721
Adjacent sequences: A199425 A199426 A199427 * A199429 A199430 A199431
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KEYWORD
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nonn,base
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AUTHOR
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Carlos Rivera, Nov 06 2011
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EXTENSIONS
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More terms from Giovanni Resta, Aug 15 2019
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STATUS
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approved
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