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Search: id:A024127
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| 0, 10, 120, 1330, 14640, 161050, 1771560, 19487170, 214358880, 2357947690, 25937424600, 285311670610, 3138428376720, 34522712143930, 379749833583240, 4177248169415650, 45949729863572160, 505447028499293770
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OFFSET
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0,2
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COMMENT
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Numbers n for which the expression 11^n/(n+1) is an integer. - Paolo P. Lava (ppl(AT)spl.at), May 29 2006
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FORMULA
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G.f.: 1/(1-11*x)-1/(1-x). E.g.f.: e^(11*x)-e^x. [From Mohammad K. Azarian (azarian(AT)evansville.edu), Jan 14 2009]
a(n)=11*a(n-1)+10 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 30 2009]
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EXAMPLE
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For n=2, a(2)=11*0+10=10; n=3, a(3)=11*10+10=120; n=4, a(4)=11*120+10=1330 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 30 2009]
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CROSSREFS
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Sequence in context: A030022 A069673 A069498 this_sequence A005949 A027568 A034255
Adjacent sequences: A024124 A024125 A024126 this_sequence A024128 A024129 A024130
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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