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A050987 Number of n-digit left-truncatable primes. 14
4, 11, 39, 99, 192, 326, 429, 521, 545, 517, 448, 354, 276, 212, 117, 72, 42, 24, 13, 6, 5, 4, 3, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

Angell, I. O. and Godwin, H. J. "On Truncatable Primes." Math. Comput. 31, 265-267, 1977.

LINKS

Table of n, a(n) for n=1..24.

Index entries for sequences related to truncatable primes

P. De Geest, The list of 4260 left-truncatable primes

Eric Weisstein's World of Mathematics, Truncatable Prime.

Index entries for sequences related to numbers of primes in various ranges

CROSSREFS

Cf. A033664, A024785, A032437, A020994, A024770, A052023, A052024, A052025, A050986.

Sequence in context: A149257 A255706 A203161 * A137191 A106269 A126758

Adjacent sequences:  A050984 A050985 A050986 * A050988 A050989 A050990

KEYWORD

base,nonn,easy,fini,full

AUTHOR

Eric W. Weisstein

EXTENSIONS

Edited by Ray Chandler, Mar 13 2007

STATUS

approved

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Last modified September 24 04:27 EDT 2017. Contains 292403 sequences.