A138359 List of quadruples of strictly non-palindromic primes without an ordinary prime in between them.

44449, 44453, 44483, 44491, 120811, 120817, 120823, 120829, 315037, 315047, 315059, 315067, 583069, 583087, 583127, 583139, 617411, 617429, 617447, 617453, 1553423, 1553429, 1553437, 1553467, 1712329, 1712339, 1712353, 1712369

Offset

1,1

Comments

For triples of this kind, see A138358.

For quintuples of this kind, see A138360.

References

Karl Hovekamp, Palindromzahlen in adischen Zahlensystemen, 2004

Links

Table of n, a(n) for n=1..28.

K. Hovekamp, Palindromic numbers in different bases.

K. Hovekamp, Strictly non-palindromic prime 5-tuple, quadruple and triple up to 1 billion

Wikipedia, Strictly non-palindromic numbers.

Example

Primes:
...
44417 palindromic in bases 50, 106, 135 and 141
44449 strictly non-palindromic
44453 strictly non-palindromic
44483 strictly non-palindromic
44491 strictly non-palindromic
44497 palindromic in base 67 and base 206
...
So {44449, 44453, 44483, 44491} is the first quadruple of strictly non-palindromic primes.

Crossrefs

Cf. A138358, A138360, A138329, A016038, A047811, A016038.

Sequence in context: A204668 A115959 A045937 * A178553 A216203 A194355

Adjacent sequences: A138356 A138357 A138358 * A138360 A138361 A138362

Keyword

base,nonn,tabf

Author

Karl Hovekamp, Mar 16 2008

Status

approved