A108854 - OEIS

A108854

Numbers n such that 10*n - 127 is prime.

13, 14, 15, 17, 18, 20, 21, 23, 24, 29, 30, 32, 35, 36, 39, 41, 42, 44, 48, 50, 51, 56, 57, 59, 63, 65, 69, 72, 74, 77, 78, 80, 81, 86, 87, 90, 95, 98, 99, 101, 108, 111, 114, 116, 119, 122, 123, 125, 128, 129, 132, 134, 135, 141, 143, 150, 155, 156, 158, 161, 162

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..61.

EXAMPLE

If n=13 then 10*n - 127 = 3 (prime).

If n=39 then 10*n - 127 = 263 (prime).

MAPLE

a:=proc(n) if isprime(10*n-127)=true then n else fi end: seq(a(n), n=0..200); # Emeric Deutsch, Jul 18 2005

MATHEMATICA

Select[Range[13, 200], PrimeQ[10#-127]&] (* Harvey P. Dale, Aug 22 2021 *)