OFFSET
1,1
COMMENTS
The term a(6) = 1783166 is such that 7*a(6)^7 == 777777792 (mod 10^9). Therefore, all numbers congruent to a(6) (mod 5*10^8) are also in the sequence. Of course, for any term a(n), all numbers a(n)*10^k, k >= 0, are also in the sequence. - M. F. Hasler, Jul 16 2024
REFERENCES
C. A. Pickover, "Keys to Infinity", New York: Wiley, p. 7, 1995.
LINKS
Giovanni Resta, super-d numbers, personal web site "Numbers Aplenty", 2013.
Eric Weisstein's World of Mathematics, Super-d Number.
MATHEMATICA
Select[Range[6*10^6], MemberQ[Partition[IntegerDigits[7#^7], 7, 1], {7, 7, 7, 7, 7, 7, 7}]&] (* Harvey P. Dale, Sep 01 2014 *)
PROG
for(n=1, oo, is_A032747(n)&& print1(n", ")) \\ Quite slow, even to get the first few terms. - M. F. Hasler, Jul 16 2024
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1998
STATUS
approved