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A193715 Positions of triangular numbers (A000217) in the union of squares and triangular numbers (A005214). 3
1, 2, 4, 6, 7, 9, 11, 12, 13, 15, 17, 18, 20, 22, 23, 25, 27, 29, 30, 32, 34, 35, 37, 39, 41, 42, 44, 46, 47, 49, 51, 52, 54, 56, 58, 59, 61, 63, 64, 66, 68, 70, 71, 73, 75, 76, 78, 80, 81, 82, 84, 86, 87, 89, 91, 92, 94, 96, 98, 99, 101, 103, 104, 106, 108 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
A010054(A005214(a(n))) = 1.
LINKS
PROG
(Haskell)
import Data.List (elemIndex)
import Data.Maybe (fromJust)
a193715 n = a193715_list !! (n-1)
a193715_list =
map ((+ 1) . fromJust . (`elemIndex` a005214_list)) $ tail a000217_list
CROSSREFS
Cf. A193714.
Sequence in context: A052056 A356754 A187974 * A320474 A051533 A186151
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Aug 03 2011
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)