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 A358992 a(n) is the number of digits in the product of the first n odd numbers not divisible by 5. 3
 1, 1, 1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 13, 15, 16, 18, 19, 21, 22, 24, 26, 28, 29, 31, 33, 35, 36, 38, 40, 42, 44, 46, 48, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 82, 84, 86, 88, 90, 92, 94, 96, 99, 101, 103, 105, 107, 109, 112, 114, 116 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Table of n, a(n) for n=0..65. FORMULA a(n) = A055642(A358990(n)). MATHEMATICA Table[Length[IntegerDigits[Product[2i+2Floor[(i-3)/4]+1, {i, n}]]], {n, 0, 65}] CROSSREFS Cf. A045572, A055642, A356860, A358990. Cf. A358991 (number of zero digits), A358993 (number of nonzero digits). Sequence in context: A165737 A349996 A347517 * A033104 A191325 A190209 Adjacent sequences: A358989 A358990 A358991 * A358993 A358994 A358995 KEYWORD nonn,base AUTHOR Stefano Spezia, Dec 09 2022 STATUS approved

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Last modified August 15 10:04 EDT 2024. Contains 375173 sequences. (Running on oeis4.)