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A244557
Numbers obtained by concatenating the squares of the digits of prime(n).
2
4, 9, 25, 49, 11, 19, 149, 181, 49, 481, 91, 949, 161, 169, 1649, 259, 2581, 361, 3649, 491, 499, 4981, 649, 6481, 8149, 101, 109, 1049, 1081, 119, 1449, 191, 1949, 1981, 11681, 1251, 12549, 1369, 13649, 1499, 14981, 1641, 1811, 1819, 18149, 18181, 411, 449
OFFSET
1,1
LINKS
FORMULA
a(n) = A048385(A000040(n)).
EXAMPLE
For n = 7, prime(7) = 17 and a(7) = 149, which is the concatenation of the squares of the digits of 17. For n = 31, prime(31) = 127 and a(31) = 1449; but this term also appears at index 200, in fact prime(200) = 1223 and a(200) = 1449.
MATHEMATICA
Table[FromDigits[Flatten[IntegerDigits/@(IntegerDigits[Prime[n]]^2)]], {n, 50}] (* Harvey P. Dale, Aug 18 2016 *)
PROG
(Magma) [StringToInteger(&cat[IntegerToString(h): h in Reverse([i^2: i in Intseq(p)])]): p in PrimesUpTo(250)];
CROSSREFS
Sequence in context: A158143 A376714 A082200 * A063482 A277312 A069557
KEYWORD
nonn,base
AUTHOR
Vincenzo Librandi, Jul 02 2014
EXTENSIONS
Edited by Bruno Berselli, Jul 02 2014
STATUS
approved