

A224856


Numbers n such that 90*n + 29 and 90*n + 31 are twin primes.


1



0, 6, 7, 11, 14, 28, 30, 33, 37, 39, 47, 53, 61, 65, 74, 75, 76, 77, 84, 88, 91, 110, 128, 139, 152, 158, 170, 179, 180, 194, 195, 201, 215, 216, 228, 229, 251, 271, 282, 305, 308, 312, 334, 336, 345, 362, 366, 368, 370, 373, 383, 384, 410, 411, 413, 427, 450
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


LINKS

Table of n, a(n) for n=1..57.


FORMULA

A201739 INTERSECT A201819.


MAPLE

a:= proc(n) option remember; local k; for k from 1+
`if`(n=1, 1, a(n1)) while not (isprime(29+(90*k))
and isprime(31+(90*k))) do od; k
end:
seq(a(n), n=1..100); # Alois P. Heinz, Jul 23 2013


MATHEMATICA

Select[Range[0, 499], PrimeQ[90# + 29] && PrimeQ[90# + 31] &] (* copied from: Alonso del Arte, Jul 22 2013 *)


CROSSREFS

Cf. A201739, A201819.
Sequence in context: A190612 A270431 A315832 * A182156 A166496 A267413
Adjacent sequences: A224853 A224854 A224855 * A224857 A224858 A224859


KEYWORD

nonn,easy


AUTHOR

J. W. Helkenberg, Jul 22 2013


STATUS

approved



