A118849 Digital clock primes such that the number of minutes past midnight is also prime.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 101, 107, 113, 137, 149, 211, 229, 311, 313, 317, 331, 347, 349, 353, 359, 401, 431, 443, 547, 607, 613, 619, 641, 659, 701, 719, 743, 811, 823, 829, 907, 929, 937, 947, 953, 1013, 1019, 1031, 1117

Offset

1,1

Comments

The number of minutes past midnight represented by each of the times here can be found in A118850.

Links

Nathaniel Johnston, Table of n, a(n) for n = 1..83 (full sequence)

Formula

a(n) = A118850(n) + floor(A118850(n)/60)*40.

Maple

for h from 0 to 23 do for m from 0 to 59 do t:=100*h+m: if(isprime(60*h+m) and isprime(t))then printf("%d, ", t): fi: od: od: # Nathaniel Johnston, May 17 2011

Crossrefs

Cf. A050246, A118848, A118850.

Sequence in context: A171047 A050246 A229106 * A049561 A080191 A073350

Adjacent sequences: A118846 A118847 A118848 * A118850 A118851 A118852

Keyword

nonn,base,easy,fini,full

Author

Carl R. White, May 01 2006

Status

approved