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A117528 Prime at which the cumulative sum in A117527 is prime. 1
2, 3, 13, 41, 43, 109, 137, 167, 181, 199, 307, 373, 421, 491, 587, 661, 1009, 1097, 1117, 1373, 1471, 1483, 1601, 1607, 1787, 1913, 2053, 2089, 2203, 2267, 2591, 2819, 2953, 3191, 3361, 3623, 3691, 3779, 3877, 4051 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
At the twin primes 41 and 43, we obtain consecutive prime integer sums of 641 and 757.
LINKS
FORMULA
Multiply consecutive primes by e, take integer, sum until a prime sum is reached.
EXAMPLE
In a(5)=4007, multiplication of the prime 109*e resulted in the int sum 296. When added to previous sums, the total came to 4007, a prime.
PROG
UBASIC 10 Ct=1 20 B=nxtprm(B) 22 E=#e 30 C=int(B*E) 40 D=D+C 41 print Ct, B, C, D 50 if D=prmdiv(D) then print D:stop 55 Ct=Ct+1 60 goto 20
CROSSREFS
Sequence in context: A259261 A141511 A235615 * A264042 A122719 A106866
KEYWORD
easy,nonn
AUTHOR
Enoch Haga, Mar 25 2006
STATUS
approved

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Last modified March 30 03:01 EDT 2024. Contains 371289 sequences. (Running on oeis4.)