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A053237
Numbers n such that both A053230(n) and A053230(n+1) = 1.
7
1, 31, 38, 67, 74, 98, 128, 197, 228, 240, 247, 277, 283, 307, 313, 332, 339, 369, 382, 400, 413, 430, 459, 489, 502, 520, 551, 609, 622, 646, 664, 729, 759, 771, 823, 830, 843, 908, 915, 940, 969, 1038, 1057, 1086, 1117, 1124, 1148, 1206, 1247, 1266, 1290
OFFSET
1,2
COMMENTS
Pairs of consecutive 1's occur uncommonly often in A053230.
MAPLE
with(numtheory): f := [seq( `if`((sigma(i+1) > sigma(i)), 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);
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 10 2000
STATUS
approved