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A175762 Primes with an arithmetic mean of digits which is also prime. 1
2, 3, 5, 7, 13, 19, 31, 37, 59, 73, 1061, 1151, 1223, 1289, 1487, 1511, 1559, 1601, 1667, 1847, 1973, 1999, 2099, 2141, 2213, 2297, 2411, 2459, 2477, 2549, 2657, 2693, 2729, 2819, 2837, 2909, 2927, 2963, 3023, 3041, 3089, 3203, 3221, 3359, 3449, 3467, 3539, 3557 (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

{A000040(i): A007605(i)/A097944(i) in A000040}.

EXAMPLE

a(10)=73 because (7+3)/2=5=prime. a(12)=1151 because (1+1+5+1)/4=2=prime.

MATHEMATICA

Select[Prime[Range[500]], PrimeQ[Mean[IntegerDigits[#]]]&] (* Harvey P. Dale, Jan 16 2013 *)

CROSSREFS

Cf. A000040, A007605, A061383.

Sequence in context: A198273 A066076 A136288 * A088091 A194955 A217884

Adjacent sequences:  A175759 A175760 A175761 * A175763 A175764 A175765

KEYWORD

nonn,base,easy

AUTHOR

Juri-Stepan Gerasimov, Aug 29 2010

EXTENSIONS

Corrected (59 inserted, 1061 inserted etc.) by R. J. Mathar, Sep 24 2010

STATUS

approved

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Last modified December 13 01:23 EST 2019. Contains 329963 sequences. (Running on oeis4.)