1,1
sigma(13) + 13 = 27 = 3^3.
Sequence in context: A103968 A073544 A051361 this_sequence A005340 A114244 A050485
Adjacent sequences: A114067 A114068 A114069 this_sequence A114071 A114072 A114073
nonn
Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006
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