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 A183222 Complement of the 10-gonal numbers. 0
 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA a(n) = n - 1 + ceiling(1/2 + ((n+1)/4)^(1/2)). MATHEMATICA Table[n-1+Ceiling[1/2+((n+1)/4)^(1/2)], {n, 100}] CROSSREFS Cf. A001107 (10-gonal numbers). Sequence in context: A118764 A226134 A057717 * A063742 A014089 A065039 Adjacent sequences:  A183219 A183220 A183221 * A183223 A183224 A183225 KEYWORD nonn AUTHOR Clark Kimberling, Jan 01 2011 STATUS approved

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Last modified May 14 19:53 EDT 2021. Contains 343903 sequences. (Running on oeis4.)