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centered decagonal number

A centered decagonal number is a centered figurate number that represents a decagon with a dot in the center and all other dots surrounding the center dot in successive decagonal layers. The centered decagonal number for n is given by the formula
${\\displaystyle 5n^{2}-5n+1\\,}$
Thus, the first few centered decagonal numbers are
1, 11, 31, 61, 101, 151, 211, 281, 361, 451, 551, 661, 781, 911, 1051, ... (sequence A062786 in the OEIS)

(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Centered_decagonal_number)

centered polygonal numbers

nombre décagonal centré

francés

URI

http://data.loterre.fr/ark:/67375/PSR-KLQPNN0B-R

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