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A028868 Primes that when squared give numbers with digits in descending order. 3
2, 3, 29, 31 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

No other solutions below 2.10^9 (probably finite) - Dec 15 1999

LINKS

Table of n, a(n) for n=1..4.

CROSSREFS

Cf. A028869, A028865, A028866.

Sequence in context: A003017 A096580 A324941 * A081332 A106868 A098419

Adjacent sequences:  A028865 A028866 A028867 * A028869 A028870 A028871

KEYWORD

nonn,base,hard

AUTHOR

Patrick De Geest

STATUS

approved

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Last modified April 5 06:13 EDT 2020. Contains 333238 sequences. (Running on oeis4.)