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A053998
Smallest prime in n-th shell of prime spiral.
1
2, 3, 29, 101, 229, 421, 673, 1013, 1429, 1889, 2441, 3089, 3821, 4639, 5521, 6491, 7577, 8741, 9941, 11329, 12757, 14341, 15881, 17623, 19477, 21397, 23333, 25471, 27743, 30059, 32441, 34871, 37507, 40237, 42953, 46021
OFFSET
0,1
EXAMPLE
a(2)=3 because it is the first prime in shell 1 (prime 2 is in shell 0).
CROSSREFS
Sequence in context: A108657 A116325 A228021 * A144953 A132282 A064893
KEYWORD
easy,nonn
AUTHOR
Enoch Haga, Apr 06 2000
STATUS
approved