login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A137727 Final digit of prime(n)*prime(n+1). 1
6, 5, 5, 7, 3, 1, 3, 7, 7, 9, 7, 7, 3, 1, 1, 7, 9, 7, 7, 3, 7, 7, 7, 3, 7, 3, 1, 3, 7, 1, 7, 7, 3, 1, 9, 7, 1, 1, 1, 7, 9, 1, 3, 1, 3, 9, 3, 1, 3, 7, 7, 9, 1, 7, 1, 7, 9, 7, 7, 3, 9, 1, 7, 3, 1, 7, 7, 9, 3, 7, 7, 3, 1, 7, 7, 7, 3, 7, 9, 1, 9, 1, 3, 7, 7, 7, 3, 7, 3, 1, 3, 3, 7, 9, 7, 7, 9, 3, 3, 7, 9, 1, 7, 9, 7 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n) = Mod[ Prime[n]*Prime[n+1], 10 ]

MATHEMATICA

Table[ Mod[ Prime[n]*Prime[n+1], 10 ], {n, 1, 1000} ]

CROSSREFS

Cf. A007652 = Final digit of prime(n). Cf. A110923 = Final two digits of prime(n) (with leading zero omitted). Cf. A137728 = Second digit from the end of product of first n primes.

Sequence in context: A199600 A021608 A108088 * A010497 A167918 A070860

Adjacent sequences:  A137724 A137725 A137726 * A137728 A137729 A137730

KEYWORD

nonn,base

AUTHOR

Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 08 2008

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 15:56 EST 2012. Contains 205934 sequences.