A070277 Smallest prime ending in n, or 0 if no such prime exists.

11, 2, 3, 0, 5, 0, 7, 0, 19, 0, 11, 0, 13, 0, 0, 0, 17, 0, 19, 0, 421, 0, 23, 0, 0, 0, 127, 0, 29, 0, 31, 0, 233, 0, 0, 0, 37, 0, 139, 0, 41, 0, 43, 0, 0, 0, 47, 0, 149, 0, 151, 0, 53, 0, 0, 0, 157, 0, 59, 0, 61, 0, 163, 0, 0, 0, 67, 0, 269, 0, 71, 0, 73, 0, 0, 0, 277, 0, 79, 0, 181, 0

Offset: 1

Author

Amarnath Murthy, May 07 2002

Keywords

• base
• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10000

Programs

PARI

A070277(n) = if(!(n%2) || !(n%5), isprime(n)*n, my(k=10^#digits(n)); forprime(p=n,oo,if(0==((p-n)%k), return(p)))); \\ Antti Karttunen, Feb 06 2019

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Sep 26 2002