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Search: id:A074384
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| A074384 |
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Solutions to Mod[sigma[x],6]=5. |
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+0
7
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| 2401, 9604, 21609, 28561, 38416, 60025, 86436, 114244, 130321, 153664, 194481, 240100, 257049, 290521, 345744, 456976, 521284, 540225, 614656, 693889, 714025, 777924, 923521, 960400, 1028196, 1162084, 1172889, 1270129, 1382976, 1500625
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OFFSET
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1,1
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EXAMPLE
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4th powers of primes of the form 6k+1 are here because sigma[p^4]=p^4+p^3+p^2+p+1 congruent 1+1+1+1+1=5 mod 6. There are also other solutions.
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MATHEMATICA
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Do[s=Mod[DivisorSigma[1, n], 6]; If[s==5, Print[n]], {n, 1, 1000000}]
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CROSSREFS
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Cf. A000203, A072862, A072461, A072462.
Sequence in context: A018865 A043396 A103125 this_sequence A016924 A016984 A017152
Adjacent sequences: A074381 A074382 A074383 this_sequence A074385 A074386 A074387
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Aug 22 2002
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