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A102501 Primes of the concatenated form 7nn7. 3
715157, 718187, 719197, 734347, 736367, 739397, 748487, 752527, 757577, 760607, 767677, 775757, 779797, 781817, 785857, 796967, 797977, 7100510057, 7102010207, 7103010307, 7104710477, 7105410547, 7106210627, 7106510657, 7107410747 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

715157 is prime and of the form 7nn7 for n=15.

7100510057 is prime and of the form 7nn7 for n=1005.

CROSSREFS

Cf. A102897 for sequence of all numbers of form 7nn7. A102500 for the n values corresponding to the primes in this sequence.

Sequence in context: A234757 A232578 A249210 * A301643 A252887 A204403

Adjacent sequences:  A102498 A102499 A102500 * A102502 A102503 A102504

KEYWORD

easy,nonn,base

AUTHOR

Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 13 2005

STATUS

approved

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Last modified May 19 12:27 EDT 2019. Contains 323393 sequences. (Running on oeis4.)