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A109376
Numbers k such that k * (sum of the digits of k raised to their own power) + 1 is prime and sets a new record for number of digits.
0
1, 11, 20, 33, 35, 36, 75, 79, 390, 1991, 9199, 91899, 699949, 5299999, 39999999, 428999999, 3699949999
OFFSET
1,2
CROSSREFS
Cf. A109372.
Sequence in context: A011753 A120442 A059407 * A100038 A370917 A160843
KEYWORD
base,more,nonn
AUTHOR
Jason Earls, Aug 25 2005
EXTENSIONS
a(15) from Owen Whitby, Sep 11 2013
a(16)-a(17) from Michael S. Branicky, May 02 2024
STATUS
approved