id:A107289 - OEIS Search Results

Search: id:A107289

Displaying 1-1 of 1 results found.

page 1

Digit sum of n^2 is a prime.

+0
1

4, 5, 7, 16, 17, 25, 26, 28, 29, 32, 34, 37, 38, 40, 44, 47, 49, 50, 52, 53, 56, 61, 62, 64, 65, 70, 73, 79, 82, 83, 89, 91, 98, 106, 107, 109, 115, 116, 118, 119, 125, 127, 133, 137, 142, 143, 146, 149, 151, 154, 155, 160, 161, 164, 170, 173, 181, 182, 187, 188, 199 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = sqrt(A065408(n))`
	MATHEMATICA	`bb={}; Do[If[PrimeQ[Apply[Plus, IntegerDigits[n^2]]], bb=Append[bb, n]], {n, 500}]; bb`
	CROSSREFS	`Cf. A065408.` `Sequence in context: A072215 A106170 A085195 this_sequence A056659 A049896 A029520` `Adjacent sequences: A107286 A107287 A107288 this_sequence A107290 A107291 A107292`
	KEYWORD	`nonn,base`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), May 20 2005`

page 1

Search completed in 0.002 seconds

Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research