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A220289
Smallest composite integer in base n which remains composite after altering any one or two digits.
1
1010100, 2200100, 12321230, 324322330, 43040303150, 5411665056000, 33254100107730, 210324811482600, 977731833235239280
OFFSET
2,1
COMMENTS
Unlike A133219, changing the most significant digit to 0 is disallowed.
LINKS
Witold Jarnicki and Maciej Zenczykowski, On a property of the number 977731833235239280, arXiv:0709.3361 [math.NT], 2007.
EXAMPLE
Expressed in base 10, the terms from n=2 to 9 are: 84, 1953, 28268, 1401590, 273241578, 77478704205, 1878528135128, 48398467146642. - edited by Michel Marcus, Sep 27 2014
CROSSREFS
Cf. A133219.
Sequence in context: A234035 A330519 A066354 * A133219 A306515 A306517
KEYWORD
base,nonn,more
AUTHOR
Michel Marcus, Dec 09 2012
EXTENSIONS
Typo for a(10) corrected by Michel Marcus, Sep 27 2014
STATUS
approved