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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Pairs of consecutive 1's occur uncommonly often in A053238.
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LINKS
| Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
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MAPLE
| 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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PROG
| (Haskell)
a053245 n = a053245_list !! (n-1)
a053245_list = f a053242_list where
f (x:x':xs) | x' == x+1 = x : f xs
| otherwise = f (x':xs)
-- Reinhard Zumkeller, Oct 16 2011
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CROSSREFS
| Cf. A000203, A053226, A053238, A053239, A053240, A053241, A053242, A053243, A053244.
Sequence in context: A145220 A135286 A177725 * A115882 A007589 A049390
Adjacent sequences: A053242 A053243 A053244 * A053246 A053247 A053248
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KEYWORD
| nonn
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AUTHOR
| Asher Auel (asher.auel(AT)reed.edu) Jan 10, 2000
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