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A068072 Number of Pluperfect Digital Invariants base n. 0
1, 5, 11, 17, 30, 59, 62, 58, 88, 134, 87, 201, 103, 202, 293 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

REFERENCES

Lionel E. Deimel and Michael T. Jones: Finding Pluperfect Digital Invariants: Techniques, Results and Observations, Journal of Recreational Mathematics 14, 1981-82, pp. 87-107.

LINKS

Table of n, a(n) for n=2..16.

Walter Schneider, Perfect Digital Invariants

Dik T. Winter, Table of Armstrong Numbers

CROSSREFS

Cf. A016087.

Sequence in context: A268521 A230138 A231652 * A136292 A088046 A155882

Adjacent sequences:  A068069 A068070 A068071 * A068073 A068074 A068075

KEYWORD

base,hard,more,nonn

AUTHOR

Robert G. Wilson v, Feb 28 2002

STATUS

approved

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Last modified May 25 16:02 EDT 2017. Contains 287039 sequences.