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A125517

Number of prime 5-tuples up to 10^n.

0, 3, 5, 9, 21, 65, 321, 1383, 7221, 40414, 245312, 1552223, 10217560, 69410576, 485081195, 3473135825

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

a(3)=5 because there are 5 prime 5-tuples less than 10^3: 3 of the form p + 0,2,6,8,12 (for p = 5,11 and 101) and 2 of the form p + 0,4,6,10,12 (for p = 7 and 97).

CROSSREFS

Cf. A022006, A022007.

Sequence in context: A147758 A129787 A328525 * A147038 A146275 A089636

Adjacent sequences: A125514 A125515 A125516 * A125518 A125519 A125520

KEYWORD

nonn,more

AUTHOR

Martin Raab, Jan 21 2007

EXTENSIONS

a(13)-a(15) from Norman Luhn, Nov 05 2021

a(16) from Norman Luhn, Nov 09 2021

STATUS

approved