A123157 Sum of digits of the squares of prime numbers.

4, 9, 7, 13, 4, 16, 19, 10, 16, 13, 16, 19, 16, 22, 13, 19, 16, 13, 25, 10, 19, 13, 31, 19, 22, 4, 16, 19, 19, 25, 19, 16, 31, 16, 7, 13, 25, 28, 34, 31, 10, 19, 22, 25, 28, 19, 16, 31, 22, 16, 28, 16, 22, 10, 25, 31, 19, 19, 31, 31, 25, 34, 28, 25, 40, 22, 22, 25, 16, 13, 22, 28

Offset

1,1

Links

Table of n, a(n) for n=1..72.

Albert Frank, International Contest Of Logical Sequences, 2002 - 2003. Item 11

Albert Frank, Solutions of International Contest Of Logical Sequences, 2002 - 2003.

Maple

read("transforms"):
A123157 := proc(n)
    digsum(ithprime(n)^2) ;
end proc: # R. J. Mathar, Jul 05 2013

Mathematica

Total[IntegerDigits[#]]&/@(Prime[Range[80]]^2) (* Harvey P. Dale, Nov 04 2012 *)

Prog

(PARI) for(n=1, 100, dp2=eval(Vec(Str(prime(n)^2))); print1(sum(i=1, length(dp2), dp2[i]), ", "))

Crossrefs

Sequence in context: A397544 A179222 A388539 * A154684 A353071 A365906

Adjacent sequences: A123154 A123155 A123156 * A123158 A123159 A123160

Keyword

nonn,base

Author

Herman Jamke (hermanjamke(AT)fastmail.fm), Oct 01 2006

Status

approved