

A048646


Primes p such that the decimal digits of p^2 can be partitioned into two or more squares.


4



7, 13, 19, 37, 41, 107, 191, 223, 379, 487, 997, 1063, 1093, 1201, 1301, 1907, 2029, 3019, 3169, 3371, 5081, 5099, 5693, 6037, 9041, 9619, 9721, 9907, 10007, 11681, 12227, 12763, 17393, 18493, 19013, 19213, 19219, 21059, 21157, 21193, 25931
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OFFSET

1,1


LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000


EXAMPLE

7 is present because 7^2=49 can be partitioned into two squares 4 and 9; 13^2 = 169 = 16_9; 37^2 = 1369 = 1_36_9.
997^2 = 994009 = 9_9_400_9, 1063^2 = 1129969 = 1_12996_9, 997 and 1063 are primes, so 997 and 1063 are in the sequence.


PROG

(Haskell)
a048646 n = a048646_list !! (n1)
a048646_list = filter ((== 1) . a010051') a048653_list
 Reinhard Zumkeller, Apr 17 2015


CROSSREFS

Cf. A048375.
Cf. A010051, intersection of A048653 and A000040.
Sequence in context: A208776 A108295 A071923 * A152087 A098059 A078860
Adjacent sequences: A048643 A048644 A048645 * A048647 A048648 A048649


KEYWORD

nice,nonn,base


AUTHOR

Felice Russo


EXTENSIONS

Corrected and extended by Naohiro Nomoto, Sep 01 2001


STATUS

approved



