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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 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 Cf. A000040, A048385. Sequence in context: A158142 A158143 A082200 * A063482 A277312 A069557 Adjacent sequences: A244554 A244555 A244556 * A244558 A244559 A244560 KEYWORD nonn,base AUTHOR Vincenzo Librandi, Jul 02 2014 EXTENSIONS Edited by Bruno Berselli, Jul 02 2014 STATUS approved

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Last modified March 31 20:29 EDT 2023. Contains 361672 sequences. (Running on oeis4.)