A156116 Five-digit mountain-type primes that increase to and decrease from the central digit, including palindromes.

12421, 12541, 12641, 12653, 12721, 12743, 12763, 12821, 12841, 12853, 12941, 12953, 12973, 12983, 13421, 13721, 13751, 13763, 13831, 13841, 13873, 13921, 13931, 13963, 14543, 14621, 14653, 14731, 14741, 14753, 14821, 14831, 14843, 14851, 14951, 14983

Offset

1,1

Comments

Sequence is finite, ending with a(185) = 78941.

Links

Nathaniel Johnston, Table of n, a(n) for n = 1..185 (full sequence)

Maple

for a from 1 to 9 do for b from a+1 to 9 do for c from b+1 to 9 do for d from 2 to c-1 do for e from 1 to d-1 do n:=10000*a+1000*b+100*c+10*d+e: if(isprime(n))then printf("%d, ", n): fi: od:od:od:od:od: # Nathaniel Johnston, Jun 23 2011

Crossrefs

Sequence in context: A248084 A224120 A233964 * A068676 A252613 A221016

Adjacent sequences: A156113 A156114 A156115 * A156117 A156118 A156119

Keyword

nonn,base,easy,fini,full

Author

Ki Punches, Feb 14 2009

Extensions

Minor edits by Ray Chandler, Feb 20 2009

Status

approved