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Search: id:A053245
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| 20, 49, 56, 79, 108, 132, 145, 170, 177, 230, 253, 277, 289, 307, 347, 382, 405, 412, 424, 437, 495, 548, 585, 592, 633, 645, 704, 734, 752, 764, 789, 802, 841, 854, 930, 943, 967, 974, 1005, 1012, 1053, 1066, 1130, 1154, 1179, 1186, 1216, 1223, 1264
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Pairs of consecutive 1's occur uncommonly often in A053238.
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MAPLE
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with(numtheory): f := [seq( `if`((sigma(i) > sigma(i+1)), i, print( )), i=1..5000)];
seq(`if`((f[i+2]-f[i+1]=1) and (f[i+1]-f[i]=1), i, print( )), i=1..1500);
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CROSSREFS
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Cf. A000203, A053226, A053238, A053239, A053240, A053241, A053242, A053243, A053244.
Sequence in context: A044478 A145220 A135286 this_sequence A115882 A007589 A049390
Adjacent sequences: A053242 A053243 A053244 this_sequence A053246 A053247 A053248
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KEYWORD
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nonn
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AUTHOR
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Asher Auel (asher.auel(AT)reed.edu) Jan 10, 2000
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