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A137727 Final digit of prime(n)*prime(n+1). +0
2
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; listen)
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: A050815 A021608 A108088 this_sequence A010497 A070860 A019850

Adjacent sequences: A137724 A137725 A137726 this_sequence A137728 A137729 A137730

KEYWORD

nonn,base

AUTHOR

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

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Last modified July 23 10:48 EDT 2008. Contains 142285 sequences.


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