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A177202 Nontrivially polygonal-free numbers. 1
1, 2, 3, 4, 5, 7, 8, 11, 13, 14, 17, 19, 23, 26, 29, 31, 37, 38, 41, 43, 47, 53, 59, 61, 62, 67, 71, 73, 74, 77, 79, 83, 86, 89, 97, 101, 103, 107, 109, 113, 119, 122, 127, 131, 134, 137, 139, 143, 146, 149, 151, 157, 158, 161, 163, 167, 173, 179 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Positive integers which are not multiples of any nontrivially polygonal numbers A090466. Generalization of squarefree numbers: numbers that are not divisible by a square greater than 1 (A005117) where "square" is replaced by triangular, square, pentagonal, hexagonal, and so forth. Positive integers which are not positive integer multiples of numbers in the array of A057145 below the second row (which has every positive integer) and right of the 2nd column (which has every positive integer). That is, positive integers which are not positive integer multiples of any triangular number >3, any square >4, any pentagonal number >5, any hexagonal number >6, any heptagonal number >7, any octagonal number >8, any 9-gonal (nonagonal) number >9 and so forth. Properly includes all primes.
LINKS
FORMULA
Complement of A177201.
CROSSREFS
Sequence in context: A259626 A058586 A090467 * A053868 A241912 A269870
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, May 04 2010
EXTENSIONS
Corrected and extended by Sean A. Irvine, Apr 09 2013
STATUS
approved

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Last modified June 14 12:37 EDT 2024. Contains 373400 sequences. (Running on oeis4.)