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A046496 Primes expressible as the sum of 4 consecutive palindromes. 0
827, 1231, 1553, 2039, 3169, 3251, 159683, 199687, 319699, 1999969987, 2000030009, 3200030021, 80000299997, 200000300009, 20000003000009, 1599999969999983, 15999999996999999983, 24000000003000000013 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..18.

Patrick De Geest, World!Of Numbers

FORMULA

Primes of either of two forms: 4*(a+1)*10^(2*k) + 3*10^k + 4*a - 7 or 4*(a+1)*10^(2*k) - 3*10^k + 4*a - 29, where 1 <= a <= 8 and k is positive integer. - Max Alekseyev, Apr 12 2009

EXAMPLE

319699 = 79797 + 79897 + 79997 + 80008.

CROSSREFS

Cf. A000040, A002113.

Sequence in context: A104375 A066946 A143799 * A102350 A108830 A134726

Adjacent sequences:  A046493 A046494 A046495 * A046497 A046498 A046499

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Sep 15 1998

EXTENSIONS

Extended by Max Alekseyev, Apr 12 2009

STATUS

approved

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Last modified September 18 12:28 EDT 2020. Contains 337169 sequences. (Running on oeis4.)