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 A131621 Sum of all n-digit Pell numbers. 0
 8, 111, 1562, 8119, 128103, 665857, 10506008, 147830751, 768398401, 12123924128, 63018038201, 994309609247, 13990997937704, 72722761475561, 1147432427450279, 5964153172084899, 94103450048860582, 1324136026968012719, 6882627592338442563, 108595299810873229246 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Index entries for linear recurrences with constant coefficients, signature (2, 1). EXAMPLE Sum of all 1-digit Pell numbers is 8. Sum of all 2-digit Pell numbers is 111. Sum of all 3-digit Pell numbers is 1562. MATHEMATICA With[{pnos=LinearRecurrence[{2, 1}, {0, 1}, 500]}, Table[Total[ Select[ pnos, IntegerLength[#]==n&]], {n, 20}]] (* Harvey P. Dale, Jun 13 2011 *) CROSSREFS Cf. A000129. Sequence in context: A020560 A144813 A079660 * A239754 A003721 A281951 Adjacent sequences:  A131618 A131619 A131620 * A131622 A131623 A131624 KEYWORD nonn,base AUTHOR Parthasarathy Nambi, Sep 01 2007 EXTENSIONS More terms from Harvey P. Dale, Jun 13 2011 STATUS approved

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Last modified March 28 14:56 EDT 2020. Contains 333089 sequences. (Running on oeis4.)