A109207 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A109207

Palindromic primes with digit sum = 50.

3998993, 7696967, 7778777, 7794977, 7868687, 7884887, 7958597, 9586859, 9758579, 9782879, 9938399, 138989831, 139969931, 148888841, 148969841, 157888751, 159929951, 166888661, 167787761, 168929861, 169666961, 174989471

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..13935

MATHEMATICA

Do[p=Join[IntegerDigits[n], Reverse[Drop[IntegerDigits[n], -1]]]; q=Plus@@p; If[PrimeQ[FromDigits[p]]&&q==50, Print[FromDigits[p]]], {n, 1, 10^7}] (* Vincenzo Librandi, Dec 18 2015 *)

Select[Prime@ Range[10^7], And[# == Reverse@ #, Total@ # == 50] &@ IntegerDigits@ # &] (* Michael De Vlieger, Dec 18 2015 *)

PROG

(PARI) isok(n) = isprime(n) && (d=digits(n)) && (Vecrev(d)==d) && (sumdigits(n)==50); \\ Michel Marcus, Dec 18 2015

CROSSREFS

Cf. A070250, A109184, A109185 (resp.) Palindromic primes with digit sum = 10, 20, 40 (resp.); A107579, A106760 (resp.) Primes with digit sum = 10, 20 (resp.).

Sequence in context: A047987 A234798 A146946 * A104930 A251614 A187599

Adjacent sequences: A109204 A109205 A109206 * A109208 A109209 A109210

KEYWORD

base,nonn

AUTHOR

Zak Seidov, Jun 22 2005

STATUS

approved