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A088136 Primes such that sum of first and last digits is prime. 12
11, 23, 29, 41, 43, 47, 61, 67, 83, 89, 101, 131, 151, 181, 191, 211, 223, 229, 233, 239, 241, 251, 263, 269, 271, 281, 283, 293, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 601, 607, 617, 631, 641, 647, 661, 677, 691 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Michael S. Branicky, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Prime[Range[400]], PrimeQ[First[IntegerDigits[#]]+ Last[ IntegerDigits[ #]]]&] (* Harvey P. Dale, Jun 23 2017 *)

PROG

(Python)

from sympy import isprime, primerange

def ok(p): s = str(p); return isprime(int(s[0]) + int(s[-1]))

def aupto(limit): return [p for p in primerange(1, limit+1) if ok(p)]

print(aupto(691)) # Michael S. Branicky, Nov 23 2021

CROSSREFS

Cf. A046704, A007953, A088133, A088134, A088135.

Sequence in context: A054723 A109981 A091367 * A164932 A086244 A091939

Adjacent sequences:  A088133 A088134 A088135 * A088137 A088138 A088139

KEYWORD

easy,nonn,base

AUTHOR

Zak Seidov, Sep 20 2003

STATUS

approved

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Last modified September 28 14:44 EDT 2022. Contains 357073 sequences. (Running on oeis4.)