# ⓘ 115 (number)

## ⓘ 115 (number)

115 has a square sum of divisors:

σ 115 = 1 + 5 + 23 + 115 = 144 = 12 2. {\displaystyle \sigma 115=1+5+23+115=144=12^{2}.}

There are 115 different rooted trees with exactly eight nodes, 115 inequivalent ways of placing six rooks on a 6 × 6 chess board in such a way that no two of the rooks attack each other, and 115 solutions to the stamp folding problem for a strip of seven stamps.

115 is also a heptagonal pyramidal number. The 115th Woodall number,

115 ⋅ 2 115 − 1 = 4 776 913 109 852 041 418 248 056 622 882 488 319, {\displaystyle 115\cdot 2^{115}-1=4\;776\;913\;109\;852\;041\;418\;248\;056\;622\;882\;488\;319,}

is a prime number.

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• Thyra minor planet designation: 115 Thyra is a fairly large and bright inner main - belt asteroid that was discovered by Canadian - American astronomer
• Route 115 is a short south north highway in southeastern Massachusetts. The route connects several small towns in western Norfolk County, ending just
• SM U - 115 was a German Type U 115 U - boat Projekt 43 of the Imperial German Navy built at Schichau - Werke, Elbing. As her sister ship SM U - 116, she was
• The British Rail Class 115 diesel multiple units were 41 high density sets which operated the outer - suburban services from Marylebone usually to destinations
• The Agusta A. 115 registration I - AGUC was a prototype helicopter flown in 1961 in Italy. It was essentially a Bell 47J - 3 with an unclad, tubular tail
• List of highways in Puerto Rico List of highways numbered 115 Para designar la Carretera Estatal PR - 115 como Avenida Profesor Tomas Bonilla Feliciano

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