A089317 Prime worms [successive digit differences with absolute value of 4].

151, 373, 95959, 9515959, 159595151, 159595951, 15151595951, 15951595151, 95951515159, 1515159515951, 1515959515951, 1515959595151, 1595159515151, 1595159595151, 9515151515159, 9515159515159, 9515159595959, 9595159515959

Offset

0,1

References

Carlos Rivera's primepuzzles.net, Puzzle 246

Links

Table of n, a(n) for n=0..17.

Carlos Rivera, Puzzle 246. The worm

Formula

Select prime numbers having the same first and last digits; if the uniform absolute value of successive digit differences is 4, add to sequence.

Example

a(1)=373; first and last digits are 3; abs(3-7)=4; abs(7-3)=4; the worm is 3.

Crossrefs

This is a subsequence of A048401. Cf. A089291, A089315-A089316, A048398-A048405.

Sequence in context: A078858 A217498 A078967 * A141982 A142271 A264822

Adjacent sequences: A089314 A089315 A089316 * A089318 A089319 A089320

Keyword

easy,nonn,base

Author

Enoch Haga, Dec 25 2003

Extensions

More terms from David Wasserman, Sep 09 2005

Status

approved