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A123157 Sum of digits of the squares of prime numbers. 12
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 (list; graph; refs; listen; history; text; internal format)
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: A155787 A338304 A179222 * A154684 A256174 A096982

Adjacent sequences:  A123154 A123155 A123156 * A123158 A123159 A123160

KEYWORD

nonn,base

AUTHOR

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

STATUS

approved

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Last modified May 8 23:53 EDT 2021. Contains 343685 sequences. (Running on oeis4.)