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A166923 Digital sum of prime(n)^2. 1
4, 9, 7, 4, 4, 7, 1, 1, 7, 4, 7, 1, 7, 4, 4, 1, 7, 4, 7, 1, 1, 4, 4, 1, 4, 4, 7, 1, 1, 7, 1, 7, 4, 7, 7, 4, 7, 1, 7, 4, 1, 1, 4, 7, 1, 1, 7, 4, 4, 7, 1, 7, 4, 1, 7, 4, 1, 1, 4, 4, 7, 7, 1, 7, 4, 4, 4, 7, 7, 4, 4, 1, 4, 7, 1, 7, 4, 1, 7, 7, 7, 4, 1, 1, 4, 4, 1, 4, 4, 7, 1, 4, 1, 7, 7, 1, 7, 1, 1, 1, 4, 1, 7, 4, 7 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

MATHEMATICA

Table[If[(m9=Mod[Prime[n]^2, 9])==0, 9, m9], {n, 200}]

CROSSREFS

Cf. A010888, A038194.

Sequence in context: A053511 A021909 A018880 * A021205 A056992 A169908

Adjacent sequences:  A166920 A166921 A166922 * A166924 A166925 A166926

KEYWORD

base,nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Oct 23 2009

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Last modified February 15 10:28 EST 2012. Contains 205763 sequences.