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A038582 Numbers k such that sum of the first k primes is a palindrome. 3
1, 2, 8, 7693, 8510, 12941, 146134, 637571, 27198825, 53205635, 6283318531, 7167375533, 226095996998, 435966708249 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(13) > pi(10^12). - Donovan Johnson, Apr 25 2010

a(15) > 2.83*10^12. - Giovanni Resta, Sep 01 2018

LINKS

Table of n, a(n) for n=1..14.

C. Rivera, Source

EXAMPLE

2+3+5+7+11+13+17+19 = 77.

PROG

(PARI)

rev(n)=r=""; d=digits(n); for(i=1, #d, r=concat(Str(d[i]), r)); eval(r)

s=0; for(n=1, 10^6, s+=prime(n); if(rev(s)==s, print1(n, ", "))) \\ Derek Orr, Aug 16 2014

CROSSREFS

Cf. A007504, A038583, A038584, A058845.

Sequence in context: A133376 A179056 A160814 * A309860 A058437 A185681

Adjacent sequences:  A038579 A038580 A038581 * A038583 A038584 A038585

KEYWORD

nonn,base,more

AUTHOR

Jud McCranie

EXTENSIONS

a(11)-a(12) from Donovan Johnson, Apr 25 2010

a(13)-a(14) from Giovanni Resta, Aug 30 2018

STATUS

approved

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Last modified May 31 07:09 EDT 2020. Contains 334747 sequences. (Running on oeis4.)