A164821 Number of letters in n-th prime (in German).

4, 4, 4, 6, 3, 8, 8, 8, 14, 14, 13, 16, 13, 14, 16, 14, 14, 13, 16, 13, 14, 14, 14, 14, 16, 14, 14, 16, 14, 18, 26, 23, 26, 24, 24, 23, 26, 24, 26, 24, 24, 23, 23, 24, 26, 24, 14, 25, 27, 25, 25, 25, 24, 24, 27, 25, 25, 24, 27, 24, 25, 25, 17, 14, 19, 19, 24

Offset: 1

Author

Ivan Panchenko, Aug 27 2009

Keywords

• nonn
• word

Comments

A letter with a diaeresis (for example 5 = "fünf" (not "fuenf")) or with an "ß" (in 30 = "dreißig" (not "dreissig")) is still counted as a single letter.

Examples

			a(1) = 4 because the first prime is 2, and it has in the German language (zwei) 4 letters.
		

Crossrefs

Cf. A000040, A007208.

Formula

a(n) = A007208(A000040(n)). [R. J. Mathar, Oct 09 2010]

Extensions

a(11), a(12) corrected and more terms by Georg Fischer, Dec 19 2020