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 A053240 n for which values not equal to 2 occur in the expansion of A053238. 8
 5, 20, 21, 29, 34, 49, 50, 56, 57, 65, 70, 79, 80, 94, 99, 108, 109, 123, 132, 133, 145, 146, 154, 155, 170, 171, 177, 178, 198, 200, 201, 227, 230, 231, 239, 244, 253, 254, 259, 260, 274, 277, 278, 280, 289, 290, 304, 307, 308, 310, 327, 332, 340, 341, 347 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS _Reinhard Zumkeller_, Table of n, a(n) for n = 1..10000 MAPLE with(numtheory): f := [seq( `if`((sigma(i) > sigma(i+1)), i, print( )), i=1..5000)]; seq( `if`(f[i+1] - f[i] <> 2, i, print( )), i=1..1000); PROG (Haskell) import Data.List (findIndices) a053240 n = a053240_list !! (n-1) a053240_list = map (+ 1) \$ findIndices (/= 2) a053238_list -- Reinhard Zumkeller, Oct 16 2011 CROSSREFS Cf. A000203, A053226, A053238, A053239, A053241 (complement), A053242, A053243, A053244, A053245. Sequence in context: A030696 A098047 A101728 * A034123 A088973 A005240 Adjacent sequences:  A053237 A053238 A053239 * A053241 A053242 A053243 KEYWORD nonn AUTHOR Asher Auel (asher.auel(AT)reed.edu) Jan 10, 2000 STATUS approved

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Last modified May 22 01:57 EDT 2013. Contains 225510 sequences.